T-6B Environmental Control System (ECS)• Provides automatic temperature and pressurization control...

T-6B Environmental Control System (ECS)

Created: 5 Sep 2015Updated: 14 Sep 2019

T6BDriver.com

Objectives

• Identify components and understand operation of heating/defog/ventilation/air conditioning systems

• Understand Environmental Control Panel switches and operation

• Identify operations limits of heating/defog/ventilation/air conditioning systems

• Identify canopy components and understand normal and emergency operations

• Identify anti-G components and understand normal operations of system

(Utilize ECS system schematic while reviewing this slideshow)

References

• T-6B NATOPS Manual• Section 1

• Environmental Control System

• Bleed Air Supply System

• Canopy Seal and Anti-G System

• Heating and Defogging System

• Pressurization System

• Cockpit and Avionics Cooling System

• Fresh Air Ventilation

• Canopy

• Canopy Operation Procedures

• Canopy Fracturing System (CFS)

• Emergency Ground Egress System

• Section 5• Figure 5-1 Instrument Markings

• Miscellaneous Limitations

• Equipment Cooling Limitations

• Cockpit Pressurization System Limitations

• Canopy Wind Limitations

• Provides automatic temperature and pressurization control

• Utilizes engine bleed air from right side for heating, defog, pressurization, anti-G, and canopy seal

• Cockpit cooling provided by a separate vapor-cycle system (air conditioning)

• Fresh air ventilation available for non-pressurized flight

• Environmental Control Panel in front cockpit only

ECS System Overview

Rt Side P3 Port

Inflow Valve(Bi-Level Flow Control

& Shutoff Valve)

300 F

DUCT TEMP

Heat Exchanger

CKPT PX

(Delta P: 3.9 - 4.0)

Defog Valve(Bi-Level Flow Control

& Bypass Valve)

Canopy Seal/Anti-G Electric Shutoff Valve

DEFOG

OFF

DEFOG (ON):-Opens BLFC & BPV-Opens BLFC & SOV to “HI”-Turns on Air Conditioner-Up to 40 sec to close

HI

NORM

OFF

BLEED AIR

INFLOW

Bleed Air Inflow:HI: Full openNORM: Half-way openOFF: Closed

Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR

FLOWHeat Exchanger

Bypass Valve

HOTCOLD

AUTO

MANUAL

60-90 F

(Closes @ 8,000’)

Firewall Shutoff Valve

Defog

Defog

Butterfly Valve

Butterfly Valve

Foot Warmer

Foot Warmer

CANOPY

FOOT

Heating Sys Ejector(Increases defog volume)

Canopy Seal Valve

G-Suit

G-Suit

WaterSeparator

7 psiSafety Valve

Temp Sensor

Temp Sensor

Cockpit Temp Control Sensor

Cabin Temp Sensor

Dump Solenoid

Control Valve Regulator

Control Valve

Safety Outflow Valve

Delta-P Regulator

NORM

DUMP

PRESSURIZATION

RAM/

DUMPPressurization:RAM/DUMP: Opens Control Valve & Fresh

Air Valve / Dumps pressDUMP: Dumps pressNORM: Follows normal press sched

WOW

(Delta-P: 3.6 +/-0.2)

Evap Blwr

Evap Blwr

CKPT ALT

(Cabin: 19,000’)

Acft Alt Cabin Alt31,000’ 16,600’

18,069’ 8,000’(3.6 +/-0.2 ΔP)

8,000’ 8,000’(Pressurization Begins)

Defog

Rt Side P3 Port


& Shutoff Valve)Defog Valve

(Bi-Level Flow Control & Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


• Bleed air tapped off of compressor section on right side (P3 port) for:• Defogging• Heating• Pressurization• Anti-G• Canopy Seal

• 3 Main valves in system:• Inflow Valve

• Also called Bi-level Flow Control and Shutoff Valve• Controlled by BLEED AIR INFLOW switch on Environmental Control Panel (front cockpit)• Allows bleed air from P3 port for ECS operations• With Air Conditioner switch ON and aircraft below 7500 feet (pressurization not required) the Inflow

Valve is auto closed (regardless of Bleed Air Switch) to improve cooling (opens if heat required)

• Defog Valve• Also called Bi-level Flow Control and Bypass Valve• Controlled by DEFOG switch (front cockpit)• Increases volume of bleed air to assist with defogging canopy

• Canopy Seal/Anti-G Electrical Shutoff Valve• Controlled by BLEED AIR INFLOW switch on Environmental Control Panel (front cockpit)• Allows bleed air to anti-G system and canopy pressure seal

Bleed Air Supply(Rt Side P3 Port)

Rt Side P3 Air

Rt Side Gas Generation Section

Fwd

Eng Air Intake

Inflow Valve

Defog Valve

Canopy/Anti-G Valve

Bleed Air Inflow Switch

Defog Switch

Rt Side P3 Tap

Rt Side P3 Port





DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


• Bleed Air Inflow Switch• On Environmental Control Panel (front cockpit only)• Opens Inflow Valve to allow bleed air for ECS operations• Opens Canopy/Anti-G Valve to allow bleed air to anti-G system and canopy seal• 3 position switch:

• OFF – Inflow Valve closed• NORM – Inflow Valve half-way open• HI – Inflow Valve full open

• Defog Switch• Switch in front cockpit only (center console)• Placing switch to ON:

• Opens Defog Valve (increases volume of bleed air to assist with defogging canopy)• Commands Inflow Valve to full open (regardless of BLEED AIR INFLOW switch position)• Turns on air conditioner (regardless of AIR COND switch position)• Reduces climb performance by 47%

• Can take up to 40 seconds for valves to close after selecting OFF• Increases ITT for a given PCL setting due to higher bleed air load on engine


Rt Side P3 Air


Fwd

Eng Air Intake

Inflow Valve

Defog Valve

Canopy/Anti-G Valve


Defog Switch

Rt Side P3 Port





DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


• Power Source• Inflow Sys CB controls power to system• Inflow Valve, Defog Valve, and Canopy/Anti-G Valve are ALL powered through one CB• Canopy/Anti-G fail safes to close if power is lost


Rt Side P3 Air


Fwd

Eng Air Intake

Inflow Valve

Defog Valve

Canopy/Anti-G Valve

Inflow Sys CB

Rt Side P3 Port


& Shutoff Valve)

Heat Exchanger


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

• Cools bleed air for use in ECS

• Divided into 2 sections:• Cooling for anti-G/canopy seal/OBOGS (left side)• Cooling for all other ECS functions

• Air directed to heat exchanger by cooling air inlet duct on nose

• On ground, flap covers inlet duct and WOW switch activates blower to push air across heat exchanger

• A DUCT TEMP caution illuminates if either Temp Sensor registers 300°F in ECS ducting

Heat Exchanger

Heat Exchanger

Temp Sensor

Temp Sensor300 F

DUCT TEMP

Cooling Air Inlet

Defog Line

Anti-G/Canopy Seal Line

Blower

Inflow Line

Rt Side P3 Port


& Shutoff Valve)

Heat Exchanger


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR

FLOW(Closes @ 8,000’)

• Provides positive cockpit air ventilation and improved air quality when open

• Air from cooling air inlet duct directed through Fresh Air Valve into cockpit

• Position of Fresh Air Valve (during ground ops & unpressurized flight) is controlled by RAM AIR INFLOW switch on Environmental Control Panel

• 3 Position switch:• OFF – Fresh Air Valve closed• NORM – Fresh Air Valve half-way open• HI – Fresh Air Valve full open

• Closes at approx. 8000’ PA as cockpit begins to pressurize (regardless of switch position)

Fresh Air Valve

Ram Air Flow Switch

Temp Sensor

Temp Sensor300 F

DUCT TEMP

Rt Side P3 Port


& Shutoff Valve)

Heat Exchanger


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR


• Valve controlled by Temperature Controller (automatic or manual)

• Mixes hot bleed air, downstream of heat exchanger to maintain selected temperature

• Temperature Controller• Front cockpit only• In AUTO:

• Maintains cockpit temp between 60 and 90°F (Auto)• 2 sensors in cockpit to relay temperature to Temp Controller (Auto)• Valve closes if Temp Controller detects 165°F at cockpit temperature control

sensor (tries to prevent duct over-temp)

• In MANUAL:• Direct control of valve• Spring loaded to middle position• Hold toward COLD closes valve/hold toward HOT opens valve

Heat Exchanger Bypass Valve

HOTCOLD

AUTO

MANUAL

60-90 F



Cabin Temp Sensor

Temp Sensor

Temp Sensor300 F

DUCT TEMP

Heat Exchanger

Defog Line

Anti-G/Canopy Seal Line

Blower

Inflow LineHeat Exchanger Bypass Valve

Temperature Controller

Rt Side P3 Port


& Shutoff Valve)

Heat Exchanger


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR


• Firewall Shutoff Valve• Controlled by Firewall Shutoff Handle (front cockpit only)• Handle lifts vertically and has clip to hold down in place• Used during emergency to cut off bleed air from going aft of firewall• Valve in right side maintenance access bay (next to Hydraulic Shutoff Valve)

• Heating System Ejector• Bleed air passes through a venturi• Drop in static pressure draws ambient cockpit air into ECS ducting• Increases volume of air to defog

Bleed Air Supply to Cockpit

HOTCOLD

AUTO

MANUAL

60-90 F



Cabin Temp Sensor

Temp Sensor

Temp Sensor300 F

DUCT TEMP



Firewall Shutoff Handle Cable

ECS Duct


Firewall Shutoff Handle(Front Cockpit)

Rt Side P3 Port


& Shutoff Valve)

300 F

DUCT TEMP

Heat Exchanger


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR

FLOWHeat Exchanger

Bypass Valve

HOTCOLD

AUTO

MANUAL

60-90 F

(Closes @ 8,000’)


Defog

Defog

Butterfly Valve

Butterfly Valve

Foot Warmer

Foot Warmer

CANOPY

FOOT


Temp Sensor

Temp Sensor


Cabin Temp Sensor

WOW

• Control lever in front cockpit only (center console)

• Mechanically positions a butterfly valve in ducts (both cockpits) to direct air to selected location

• Placarded as AIR with positions of CANOPY & FOOT• CANOPY – Directs air to windshield defog (front) and canopy defog outlets (both cockpits)

**Defog air is provided to canopy from mid-lever position and above• FOOT – Directs air to foot warmer outlets (both cockpits)

Vent Control Lever

Defog

Vent Control Lever

Rt Side P3 Port


& Shutoff Valve)

300 F

DUCT TEMP

Heat Exchanger


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR

FLOWHeat Exchanger

Bypass Valve

HOTCOLD

AUTO

MANUAL

60-90 F

(Closes @ 8,000’)


Defog

Defog

Butterfly Valve

Butterfly Valve

Foot Warmer

Foot Warmer

CANOPY

FOOT


Canopy Seal Valve

G-Suit

G-Suit

WaterSeparator

7 psiSafety Valve

Temp Sensor

Temp Sensor


Cabin Temp Sensor

• Canopy Seal/Anti-G Valve controlled by BLEED AIR INFLOW switch on Environmental Control Panel

• Allows bleed air to anti-G system and canopy pressure seal

• Valve fails to closed position if power lost through Inflow Sys CB on Battery CB Panel

• Air passes through heat exchanger then water separator removes moisture from air

• Safety Valve provides pressure relief if pressure exceeds 7 psi

• Air flows to Canopy Seal Valve & anti-G Suit connectors in both cockpits

• Canopy pressure seal inflates once weight is off wheels

Canopy Seal/Anti-G Systems

Defog


Fwd

Canopy/Anti-G Valve

Bleed Air Inflow SwitchCanopy/Anti-G

Line

• Side opening – oil filled strut to assist with opening

• Bird strike capable (4 pound bird up to 270 kts) – windscreen & front transparency

• Components:• Canopy frame• Windscreen• Front transparency• Rear transparency• Weather seal• Pressure seal

Canopy

Canopy Weather Seal (Pressure Seal not visible)

Windscreen Front Transparency

Rear Transparency

Canopy Frame

Canopy

Hook Guide Pin

5 Over-Centering Hooks & Guide Pins

• Latching mechanism• Continuous drive rod (internally down canopy frame)• Attached to external & internal canopy handle• Drives 5 over-centering hooks & guide pins in to canopy rail to secure canopy

• Mechanical Canopy Lock Indicators• 2 in each cockpit behind internal canopy handle• Green tab showing to indicate canopy is latched• No tab indicates canopy is not latched

• Electrical Sensing System• 4 microswitches – 3 in latching mechanism / 1 on canopy sill (forward edge)• Activate a CANOPY warning to indicate the canopy is not latched

• Canopy operation procedures in Section 1 of NATOPS (Know them!!)

Canopy Rail

Mechanical Lock Indicator

• External Canopy Handle• Must push Unlock Button to move out of CLOSE position• One handle located by front cockpit only

• Internal Canopy Open & Lift Handle• Both cockpits• Rotate forward to latch canopy• Lift Lock Release Lever to rotate handle aft to unlatch canopy

• Canopy Lock Release Handle• On outboard, right side of both cockpits• Pulled to release over-center lock and allow canopy to close

Canopy External Canopy Handle

Internal Canopy Open & Lift Handle

Canopy Lock Release Handle

Lock Release Lever

CanopyOperation

Closing from Inside (not full procedure)

**Always ensure canopy rail is cleared and CFS Pin Storage Box is closed prior to canopy movement**

• To close canopy from inside:• Pull canopy lock release handle (right side)• Grab canopy frame (left hand) & pull canopy past the center position then release canopy lock release handle• Pull canopy (left hand on canopy frame & then use elbow) down to canopy sill (ensure internal handle is full aft)• Rotate internal handle forward slowly until resistance is felt then reverse direction until pressure is relieved then

continue to rotate handle forward to LATCHED position

Once closed

• Momentarily lift lock release lever (check canopy warning illuminate and handle does not rotate aft)• Gently rotate handle aft to feel canopy lock• Verify mechanical green indicators are visible

• To open canopy from inside:• Raise and hold lock release lever (aft of internal handle) with right hand• Rotate canopy handle aft to UNLOCK position with left hand• Use canopy handle (left hand) and a hand on top of canopy (right hand) to open canopy

CanopyCanopy Fracturing System (CFS)

• 2 modes of operation• Automatic – activates during ejection sequence (via CFS attach bolt assembly)• Manual – Internal CFS handle in each cockpit

• Internal CFS Handle• Located in each cockpit behind PCL• Rotate 90° then pull up to activate CFS• Handle activates respective transparency

• External CFS Handle• Now deactivated.

• Explosives• Front transparency

• Uses flexible linear shaped charge (FLSC)• Thicker transparency• Cracks into two pieces

• Rear transparency• Uses mild detonating cord (MDC)• Thinner transparency• Only centerline diamond pattern detonates on ejection• Handle detonates both periphery and diamond pattern

Internal CFS Handle(Front Cockpit)

External CFS Handle

FLSC MDC

CanopyCanopy Fracturing System (CFS)

• Operation• Pulling a CFS handle activates piezoelectric crystals (no electricity required)• Piezoelectric crystals produce electric charge to fire flash lamps• Flash lamps excite a laser rod that sends energy to front/rear cockpit optical detonators (also called

donor assembly)• Optical detonators fires a plunger into CFS acceptor assembly (on canopy)• Acceptor assembly fires mild detonating cords that lead to activation of the FSLS or MDC

Optical Detonators (Donor Assembly)

Plungers

Plungers

Acceptor Assemblies

Front Cockpit Rear Cockpit

Lead Detonating Cord

CFS Attach Bolt & Assembly (for

Ejection)

Canopy(Limitations)

• Do not open canopy on ground when surface winds exceed 40 kts

• When aircraft parked in direct sunlight in temperatures of 35°C (95°F) and above:

Storage Time Canopy/Sun Shields Requirement

>15 min Closed/Not Installed Open canopy fully for 1 hr prior to engine start

No limit On prop strut/Not Installed Open canopy fully for 15 min prior to engine start

No limit Fully open/Not Installed No limit

>15 min Closed/Installed Open canopy fully for 15 min prior to engine start

No limit On prop strut/Installed No limit

*

*

*

* Most common scenarios

• G-suit hose connector in each cockpit• aft, left side of panel• Hose mechanically connected to system• Quick disconnect coupling (for egress)

• Test Button• Aft of G-suit connection• Pushing down depresses weighted rod in system and allows bleed air to the suit

Anti-G

G-suit Hose

G-suit Connection(Front Cockpit)

G-suit Test Button

Rt Side P3 Port


& Shutoff Valve)

300 F

DUCT TEMP

Heat Exchanger


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR

FLOWHeat Exchanger

Bypass Valve

HOTCOLD

AUTO

MANUAL

60-90 F

(Closes @ 8,000’)


Defog

Defog

Butterfly Valve

Butterfly Valve

Foot Warmer

Foot Warmer

CANOPY

FOOT


Canopy Seal Valve

G-Suit

G-Suit

WaterSeparator

7 psiSafety Valve

Temp Sensor

Temp Sensor


Cabin Temp Sensor

Evap Blwr

Evap Blwr

• Engine-driven, vapor-cycle system

• Components• Evaporator Modules

• Utilizes Evap-Blower fan to pull cockpit air across cooling coils• Cooling coils exchange latent heat in the air (changes liquid refrigerant to vapor)• Discharges air through one eye-ball-type outlet and 2 outlets on the glare shield

• AC Compressor• Belt driven from prop shaft• Moves refrigerant (vapor) to the Condenser/Blower

• Condenser/Blower• Returns vapor to a high pressure liquid• Blower expels heat out 2 exhaust vents on bottom of aircraft

Air Conditioning

Defog

Air Conditioning Discharge

Blower Exhaust

Air Conditioning System Blower IntakeCompressor

Rt Side P3 Port


& Shutoff Valve)

300 F

DUCT TEMP

Heat Exchanger


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR

FLOWHeat Exchanger

Bypass Valve

HOTCOLD

AUTO

MANUAL

60-90 F

(Closes @ 8,000’)


Defog

Defog

Butterfly Valve

Butterfly Valve

Foot Warmer

Foot Warmer

CANOPY

FOOT


Canopy Seal Valve

G-Suit

G-Suit

WaterSeparator

7 psiSafety Valve

Temp Sensor

Temp Sensor


Cabin Temp Sensor

Evap Blwr

Evap Blwr

• Controls• Environmental Control Panel (front cockpit)• Rear cockpit only has EVAP BLWR rheostat• AIR COND switch turns air conditioning system ON or OFF (engages compressor)• EVAP BLWR rheostat controls the fan and volume of air blowing out air conditioning ports

• Operation• Cockpit cooling air available:

• Engine running• Generator is on line• Generator bus is powered• Either AIR COND or DEFOG switch is ON

• Bi-level pressure switch interrupts power to compressor if high or low system pressure (auto resets)• Evaporator blowers are on anytime AVIONICS MASTER switch is ON

Air Conditioning

Defog


Evaporator Blower Switch

Rt Side P3 Port


& Shutoff Valve)

300 F

DUCT TEMP

Heat Exchanger


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR

FLOWHeat Exchanger

Bypass Valve

HOTCOLD

AUTO

MANUAL

60-90 F

(Closes @ 8,000’)


Defog

Defog

Butterfly Valve

Butterfly Valve

Foot Warmer

Foot Warmer

CANOPY

FOOT


Canopy Seal Valve

G-Suit

G-Suit

WaterSeparator

7 psiSafety Valve

Temp Sensor

Temp Sensor


Cabin Temp Sensor

Dump Solenoid

NORM

DUMP

PRESSURIZATION

RAM/



Evap Blwr

Evap Blwr

• Requires structurally reinforced cockpit (pressure floor/firewall/aft bulkhead/canopy)

• Pressurization Switch• On Environmental Control Panel (front cockpit only)• Guarded 3-position switch (guarded to NORM)• Must lift guard to select DUMP or RAM/DUMP• In all switch positions, bleed air will continue to enter cockpit• NORM

• System works automatically• Normal pressurization schedule followed

• DUMP• Removes power from dump solenoid opening control valve (pressurization is lost)

• RAM/DUMP• Removes power from dump solenoid opening control valve (pressurization is lost)• Opens fresh air valve• Closes defog valve (if open)

Pressurization

Defog

Pressurization Switch

Rt Side P3 Port


& Shutoff Valve)

300 F

DUCT TEMP

Heat Exchanger

CKPT PX

(Delta P: 3.9 - 4.0)


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR

FLOWHeat Exchanger

Bypass Valve

HOTCOLD

AUTO

MANUAL

60-90 F

(Closes @ 8,000’)


Defog

Defog

Butterfly Valve

Butterfly Valve

Foot Warmer

Foot Warmer

CANOPY

FOOT


Canopy Seal Valve

G-Suit

G-Suit

WaterSeparator

7 psiSafety Valve

Temp Sensor

Temp Sensor


Cabin Temp Sensor

Dump Solenoid

NORM

DUMP

PRESSURIZATION

RAM/



Evap Blwr

Evap Blwr

CKPT ALT

(Cabin: 19,000’)


18,069’ 8,000’(3.6 +/-0.2 ΔP)


• Pressurization Schedule• Cabin altitude follows aircraft altitude as aircraft climbs from sea level• At approx. 8,000 ft PA, pressurization begins holding cockpit altitude to 8,000 ft• Cockpit altitude remains at 8,000 ft PA until a differential pressure (ΔP) of 3.6±0.2 is reached at 18,069 ft• Cockpit altitude then climbs as aircraft climbs to keep a ΔP of 3.6±0.2 • Cockpit altitude is 16,600 ft PA at service ceiling of 31,000 ft

**Notify maintenance if reading other than 3.6±0.2 are encountered at or above 18,069 ft**

• Indicators• Cockpit altitude & ΔP readout on EICAS display• Information sent to EICAS by EDM• A CKPT ALT caution illuminates & CKPALT readout on EICAS display turns amber if cabin altitude above 19,000 ft• A CKPT PX warning illuminates & ΔP readout on EICAS display turns red if cockpit ΔP exceeds 3.9 to 4.0 psi

Pressurization

Defog

Cockpit Altitude

Differential Pressure

Rt Side P3 Port


& Shutoff Valve)

300 F

DUCT TEMP

Heat Exchanger

CKPT PX

(Delta P: 3.9 - 4.0)


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR

FLOWHeat Exchanger

Bypass Valve

HOTCOLD

AUTO

MANUAL

60-90 F

(Closes @ 8,000’)


Defog

Defog

Butterfly Valve

Butterfly Valve

Foot Warmer

Foot Warmer

CANOPY

FOOT


Canopy Seal Valve

G-Suit

G-Suit

WaterSeparator

7 psiSafety Valve

Temp Sensor

Temp Sensor


Cabin Temp Sensor


Delta-P Regulator

NORM

DUMP

PRESSURIZATION

RAM/



Evap Blwr

Evap Blwr

CKPT ALT

(Cabin: 19,000’)


18,069’ 8,000’(3.6 +/-0.2 ΔP)


• ΔP Regulator• Monitors pressure differential between cockpit and outside• Sends signal to Safety Valve if ΔP exceeds 4.0 psi

• Safety Valve• Controlled by ΔP Regulator• Opens to relieve overpressure in cockpit

Pressurization(System Operation)

Defog

Cockpit AftBulkhead

Left SideAccess Plate

ΔP Regulator

Safety Valve(inside duct/ not shown

Dump Solenoid

Looking up through right E-Bay

Rt Side P3 Port


& Shutoff Valve)

300 F

DUCT TEMP

Heat Exchanger

CKPT PX

(Delta P: 3.9 - 4.0)


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR

FLOWHeat Exchanger

Bypass Valve

HOTCOLD

AUTO

MANUAL

60-90 F

(Closes @ 8,000’)


Defog

Defog

Butterfly Valve

Butterfly Valve

Foot Warmer

Foot Warmer

CANOPY

FOOT


Canopy Seal Valve

G-Suit

G-Suit

WaterSeparator

7 psiSafety Valve

Temp Sensor

Temp Sensor


Cabin Temp Sensor

Dump Solenoid


Control Valve


Delta-P Regulator

NORM

DUMP

PRESSURIZATION

RAM/



WOW

(Delta-P: 3.6 +/-0.2)

Evap Blwr

Evap Blwr

CKPT ALT

(Cabin: 19,000’)


18,069’ 8,000’(3.6 +/-0.2 ΔP)


• Dump Solenoid• Must be powered to allow Control Valve Regulator to work• Anytime solenoid is de-energized, control valve will open (unpress)• WOW switch de-energizes and prevents pressurizing• Airborne with WOW, energized and allows pressurization at 8,000 ft

• Control Valve Regulator• Monitors cockpit pressure• Adjusts position of Pressurization Control Valve to maintain

pressurization schedule

• Pressurization Control Valve• Opens & closes as directed by Control Valve Regulator

Pressurization(System Operation)

Defog

Pressurization Control Valve(inside duct/ not shown)


(inside duct/ not shown)

Dump Solenoid

Cockpit AftBulkhead

Looking up through left E-Bay

Aircraft Right Side

Rt Side P3 Port


& Shutoff Valve)

300 F

DUCT TEMP

Heat Exchanger

CKPT PX

(Delta P: 3.9 - 4.0)


& Bypass Valve)


DEFOG

OFF


HI

NORM

OFF

BLEED AIR

INFLOW


Cowl Vent

Blower

WOW

Fresh Air Valve

HI

NORM

OFF

RAM AIR

FLOWHeat Exchanger

Bypass Valve

HOTCOLD

AUTO

MANUAL

60-90 F

(Closes @ 8,000’)


Defog

Defog

Butterfly Valve

Butterfly Valve

Foot Warmer

Foot Warmer

CANOPY

FOOT


Canopy Seal Valve

G-Suit

G-Suit

WaterSeparator

7 psiSafety Valve

Temp Sensor

Temp Sensor


Cabin Temp Sensor

Dump Solenoid


Control Valve


Delta-P Regulator

NORM

DUMP

PRESSURIZATION

RAM/



WOW

(Delta-P: 3.6 +/-0.2)

Evap Blwr

Evap Blwr

CKPT ALT

(Cabin: 19,000’)


18,069’ 8,000’(3.6 +/-0.2 ΔP)


Conclusion

• Identified components and described operation of heating/defog/ventilation/air conditioning systems

• Described Environmental Control Panel switches and operation• Identified operations limits of heating/defog/ventilation/air conditioning systems• Identified canopy components and described normal and emergency operations• Identified anti-G components and described normal operations of system

Abnormal ECS Scenarios located in Procedures Section/EPs

Defog

T-6B Environmental Control System (ECS)• Provides automatic temperature and pressurization control...

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Transcript of T-6B Environmental Control System (ECS)• Provides automatic temperature and pressurization control...