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Master PRESS SYSTEM light on
- Locate fault on overhead panel. Secure faulty system. Reset for continued warning protection
- R REFR OVHT - 166 C
- O EDC Low Oil Pressure (50 psi)
- O EDC High Oil Temperature - >121 C, low level, high
- engine temp
- F FAN OUT light - fan inop or lack of airflow
REFR OVHT light
- flight: Dump EDC. After light is out, operation is permitted in the two-dot position or warmer.
- Deck: Turn off GRN AIR COND switch, after light is out, operation is permitted in the two dot position or warmer;
- (C) check L + R Heat Exchanger Blower CBs (B/MEDC).
- System: On ground, the Overtemp lockout relay will Dump EDC or Air Multiplier Valve closes, ground air switch stays on and the blower fans continue to run.
EMERGENCY DEPRESSURIZATION PROCEDURE
- With electrical power available:
- *1. AUX VENT switch - OPEN
- *2. Outflow valve switch - OPEN
- *3. EDCs - DUMP
- *4. AUX VENT switch - Close at 1 inch differential
- Without electrical power available:
- (T) depressurize pneumatically
- *5. Free-fall chute - OPEN
- If cabin altitude exceeds 10,000ft, the flight station shall:
- *1. Don smoke masks.
- *2. Alert crew.
- Regardless of cabin altitude, continue with the following steps:
- 3. Verify obstacle clearance.
- 4. Investigate pressurization loss.
- Other crewmembers should:
- Verify condition of flight station personnel, provide assistance to other personnel as required, be prepared to set Condition V
(T) INVESTIGATE A PRESS LOSS
- Check EDC Spread - if none - check that AUX VENT Switch wasn't hit. o/wise rapid Decompression procedures.
- Autopilot - not engage then scissors switch problem verified
- Check cabin altitude and cabin differential.
NO PRESSURIZATION ON TAKEOFF
- Check EDC spread - if none perform Rapid Decompression proc
- Check Ground Air Switch - Perform Rapid Decompression proc
- Check Differential - if slight, aux vent may be stuck open:
- Check Aux Vent CB
- If no differential - check Outflow valve switch
- Check Aux vent CB (MEAC/MEDC)
- Outflow Valve CB (FEAC)
- Attempt to close Outflow valve manually.
- Check for holes:
- Overwing hatch
- Free fall chute
- pyrotechnic pistol port
- bomb bay access panel
- HSC outer door
- Do PRESSURIZATION LOSS procedures.
- Try to ascertain the cause of the trouble and, if it cannot be fixed in flight, he should decide immediately whether to continue the mission or to descend to a safe altitude.
- Indication: goes to outside pressure in less than one second
- fog not to be confused with smoke
- rush of air from lungs, momentary dazed sensation, gas pains, hypoxia if O2 not immediately available.
- Investigate: Overwing Hatch, Main Cabin Door, HSC, Structural failure.
- EDC dump, loss of autopilot, other indications of scissors switch
- Do PRESSURIZATION LOSS procedures first
- 1. Pressurization ground check switch - Test
- 2. Ground air-conditioning switch - ON
- Note: Manual modulation of outflow valve may be required initially to minimize cycling.
- (T) Have FE open outflow valve completely prior to AC switch and then close in small steps to regain pressurization
- 3. Ground air sensing CB - PULL (MDC) MLC 1Upper
- 4. Pressurization ground check switch - NORMAL
- Caution: ...the ground air sensing CB should be reset after landing rollout.
- (T) Refer fans are not running!
RAPID D systems
- TEST position - allows Aux vent and outflow valves to go to position selected (Closed and Auto)
- Ground AC - EDCs undump, refer fans run, Aux vent closes
- Pull the gnd air sensing CB - Fans stop, regain control of aux vent, normal icing system (Prop and EMP)
- Reset on runway - refer fans are not running Icing systems back to ground operation.
RAPID CABIN RATE-OF-DESCENT AFTER TAKEOFF
- AUX VENT switch to open immediately
- Warn: Take action ASAP, rapid descents may injure personnel
- (C) Broken control press line, frozen line, leak, reference port blocked (port above copilot's window)
- May attempt to control pressure manually:
- Open Outflow valve
- Aux Vent Switch back to closed
- Go from OFF to Open back to OFF in quick bursts - watch cabin rate of climb
ONE EDC INOPERATIVE (AC System Malfunction in Flight) and cabin exhaust fan is operable
- reduce cabin electrical load to only that used for navigation should the cabin temperature rise excessively.
- Note: Climbing to altitude or opening equipment doors will decrease the efficiency of the air-conditioning system.
LOSS of Ground AC without Annunciator lights
- Indication: No cold air coming out of AC.
- Ground AC switch - OFF and then back ON.
- IF ground AC does not come back on, power to air multiplier valve may be off.
- Check Air Multiplier Valve CB - MEDC
- (C) Air multiplier inlet pressure or outlet temperature sensor closed air multiplier valve and secured the ground AC
- Refer fans continue to run and the switch stays on - I think.
FAN OUT light
- (T) Cabin Exhaust Fan switch - ON
- (T) Check Fan CBs (B/EMDC)
- (T) Check to see if fan is running
- (T) Consider airflow - weak EDCs at altitude
- If fan inop - execute NATOPS:
- Open equipment doors for additional cooling
- Use minimum electrical equipment
- IF both EDCs are inoperative, Open AUX VENT
EDC PRESS LOW (<50 psi oil pressure)
- Check loss of spread (driveshaft) If so, Disconnect and Dump.
- If spread is indicated:
- (T) Consider altitude and condition of other EDC, dump to see if lose pressurization, may consider dump and descend (check MOSA)
- Disconnect, check for loss of spread and Dump.
- (T) If spread remains - check EDC disconnect CB (MEDC) and
- EDC inlet and discharge indicator CB (INST 1 or 2)
- Perform Emergency Shutdown checklist
- (T) Pull engine to flight idle and call for E-handle
- Caution: Dump if continued operation due to greater emergency
- (T) Look for signs of oil loss, post observer on engine
EDC TEMP HIGH (>121 C)
- Check engine oil temperature - if high correct. (T) Cool to 60 C
- (T) Consider altitude, condition of other EDC (can dump and see if pressurization holds), consider dump and descend prior to disconnect
- If unable to control, disconnect, monitor for loss of spread, dump.
- If loss of spread is not indicated after disconnect
- (T) Check EDC Disconnect CB (MEDC) and Indicator (INST1,2)
- execute Emergency Shutdown Procedure.
- If engine is allowed to operate due to greater emergency, the EDC should be dumped.
LOSS OF EDC SPREAD without EDC PRESS LOW
- (T) Lights check
- (T) Temperature (hotter) and/or Pressurization (less differential) can verify indication - not a gauge failure.
- EDC should be Disconnected and Dumped.
- If EDC fails to disconnect, as indicated by EDC press low light remaining off, the respective engine should be secured.
- (T) Check EDC Disconnect CB - MEDC.
- If the engine is allowed to operate due to a greater emergency, the EDC should be dumped.
- Refer to AC System Malfunction (loss of one EDC)
CABIN PRESS light
- Do Pressurization Loss procedures
- Light on at cabin altitude 10,000 +- 500ft. Light out by 8,000ft on descent.
- (T) Careful reading the cabin altitude indicator, small needle indicates when over 10,000ft.
- When in doubt, go on O2
- (T) Full Forward and to the right
- Altitude - not above 12,000ft
- CABIN ALT - 10,000ft
- BAR CORR - 28"
- RATE KNOB - MAX
- Dump the nose and drop the gear, Vne or 300KIAS
- A Autopilot - Disengaged
- P Power Levers - Flight Idle
- L Landing Gear - Down
- A Airspeed - Vne to FL245 then 300KIAS
- P Pressurization - As Required
- GEAR Don't forget to raise the gear, and wait for 190 KIAS!!
AVIONICS OVERHEATING - NO GROUND AIR
- 1. Close Cabin door and hatches
- 2. Open doors on avionics racks involved
- 3. Keep cabin exhaust fan running.
- If cabin temp exceeds 27 C, selected avionics should be turned off to avoid reduction in reliability and operational readiness.
Master RACK OVHT light
- Alert the crew, activate the firebill
- Fire of Unknown Origin checklist
- Let the crew know we have a Rack Ovht light
- Locate overheated bay(s) by illuminated individual bay light(s).
- (T) reset bay to reset flight station light. Announce light out.
- Provide required cooling or secure equipment as necessary.
- Come on with MDC failure.
- The AMH-33 (Digital Magnetic Tape System) will cause the rack overheat indication when the system is initially turned on, or will illuminate continuously when a loss of airflow is detected.
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