Difference between revisions of "H-34 Choctaw/Emergency Procedures"

From
Jump to: navigation, search
(→‎Fire)
(→‎Flight Servo Failures)
 
(12 intermediate revisions by the same user not shown)
Line 10: Line 10:
 
#Apply wheel brakes
 
#Apply wheel brakes
  
−
==== Engine Failure During Climb ====
+
==== Engine Failure During Climb/Cruise ====
  
 
#Collective - FULL DOWN
 
#Collective - FULL DOWN
Line 84: Line 84:
  
 
==== In-Flight Engine Fire ====
 
==== In-Flight Engine Fire ====
 +
 +
#Collective - FULL DOWN
 +
#Airspeed - 60 knots
 +
#Throttle - CLOSED
 +
#Mixture - IDLE CUT-OFF
 +
#Fuel Boost - OFF
 +
#Fuel Selector - CLOSE
 +
#Ignition - OFF
 +
#Cabin Occupants - ALERTED
 +
#Tailwheel Lock - LOCKED
 +
#Wheel brakes - OFF
 +
#Shoulder harnesses - OFF
 +
#At 75 feet - Aft cyclic to initiate flare
 +
#At 15-20 knots - Forward cyclic to level aircraft
 +
#Collective - Gradually increase to soften landing
 +
#On ground contact - Collective full down
 +
#Wheel brakes - APPLY
 +
 +
==== Electrical Fire ====
 +
 +
#Battery-Generator Switch - OFF
 +
#Fire Extinguisher - DEPLOY
  
 
=== Main Gear Box Failure ===
 
=== Main Gear Box Failure ===
 +
 +
==== Operation Over Land ====
 +
 +
If main gearbox oil press drops below 25 psi, or a main gearbox chip light illuminates, land immediately.
 +
 +
==== Operation Over Sea ====
 +
 +
If main gearbox oil press drops below 25 psi, or a main gearbox chip light illuminates, take the following actions based on the relevant situation.
 +
 +
===== If Close to Shore or Landing Site =====
 +
 +
Proceed at a slow rate of speed (50-60 knots) to minimize overheating.
 +
 +
===== If Gearbox Temperature Pegged =====
 +
 +
# Prepare to ditch
 +
# Head toward nearest landing site
 +
# Establish slow cruise (50-60 knots) to permit a quick flare followed by ditching at first sign of failure.
 +
 +
===== If Gearbox Temperature Above Redline but not Pegged =====
 +
 +
# Prepare to ditch
 +
# Head toward nearest landing site
 +
# Monitor gearbox oil pressure.  If it drops establish slow cruise (50-60 knots) to permit a quick flare followed by ditching at first sign of failure.
 +
 +
===== Pressure Zero.  Temperature within Limits =====
 +
 +
Note: This indication could be a malfunctioning pressure gauge.
 +
 +
# Prepare to ditch
 +
# Head for nearest landing site
 +
# Monitor gearbox oil pressure.  Cruise speed and altitude may be higher than in previous two cases.
 +
# If oil temperature rises establish slow cruise (50-60 knots) to permit a quick flare followed by ditching at first sign of failure.
 +
 +
=== Ditching ===
 +
 +
# Transmit Distress Signal
 +
# Notify cabin passengers
 +
# Have cabin occupants open the cabin door
 +
# Open sliding windows in cockpit
 +
# Order copilot to secure engine prior to entering the water
 +
# Upon contact with water, continue to increase collective to slow rotor blade motion
 +
  
 
=== Electrical Failures ===
 
=== Electrical Failures ===
 +
 +
 +
==== Generator Failure ====
 +
 +
Indication - GEN WARN light illuminated
 +
 +
#Battery/Generator switch - Leave in BATT & GEN position to use only essential equipment
 +
#Unneeded Equipment and Lights - OFF
 +
#If equipment on secondary bus is needed, the Battery/Generator can be put in the  BATT ONLY position, but battery power will be used more quickly.
 +
 +
==== No 1 Inverter Failure ====
 +
 +
Indication - INST PWR FAILURE light illuminated
 +
 +
# Instruments relying on AC power will be lost
 +
# Instrument Power switch - NO 2 INV (if needed, and sufficient battery power)
 +
 +
==== No 2 Inverter Failure ====
 +
 +
Indication - Loss of ASE, radar altimeter and transponder.
 +
 +
Equipment on the bus cannot be powered in the event of a No 2 Inverter failure.
 +
 +
==== Bus shorts ====
 +
 +
Bus shorts will result in equipment on one or more busses going inoperative.  Care should be taken due to the risk of an electrical fire.
 +
 +
# Battery/Generator - OFF (at pilot's discretion)
 +
# Land - As soon as practical
  
 
=== Flight Servo Failures ===
 
=== Flight Servo Failures ===
 +
 +
# Affected servo - TURN OFF (PRI OFF or AUX OFF)
 +
# Airspeed - below 60 knots
 +
# Land - As soon as practicable

Latest revision as of 01:38, 8 July 2021

SECTION 7. EMERGENCY PROCEDURES

1 Engine Failure

1.1 Engine Failure On Takeoff

  1. Simultaneously reduce collective pitch and apply aft cyclic.
  2. Maintain directional control with pedals
  3. Increase collective pitch to cushion landing
  4. Apply wheel brakes

1.2 Engine Failure During Climb/Cruise

  1. Collective - FULL DOWN
  2. Airspeed - 60 knots
  3. Cabin Occupants - ALERTED
  4. Tailwheel Lock - LOCKED
  5. Wheel brakes - OFF
  6. Shoulder harnesses - OFF
  7. At 75 feet - Aft cyclic to initiate flare
  8. At 15-20 knots - Forward cyclic to level aircraft
  9. Collective - Gradually increase to soften landing
  10. On ground contact - Collective full down
  11. Wheel brakes - APPLY

1.3 In-Flight Restart

Note: It is the pilot's judgement on whether to attempt an in-flight restart or to make a power-off landing.

  1. Collective - FULL DOWN
  2. Throttle - CLOSED
  3. Mixture - IDLE CUT-OFF
  4. Fuel Boost - ON
  5. Fuel Selector - OPEN
  6. Ignition - BOTH
  7. Starter - DEPRESS
  8. Primer Switch - DEPRESS
  9. Mixture - RICH (after engine starts)
  10. Throttle - Increase to normal RPM

1.4 Securing Engine In Flight

  1. Throttle - CLOSED
  2. Mixture - IDLE CUT-OFF
  3. Fuel Boost - OFF
  4. Ignition - OFF
  5. Fuel Selector - CLOSE

2 Tail Rotor Failure

2.1 Tail Rotor Failure on Takeoff or Below 10 Feet

  1. Throttle - CLOSE
  2. Cyclic - Maintain Level Attitude
  3. Collective - Raise to soften landing
  4. Wheel Brakes - APPLY

2.2 Tail Rotor Failure Above 10 Feet

  1. Throttle - CLOSE
  2. Collective - FULL DOWN
  3. Airspeed - 60 knots
  4. Cabin Occupants - ALERTED
  5. Tailwheel Lock - LOCKED
  6. Wheel brakes - OFF
  7. Shoulder harnesses - OFF
  8. At 75 feet - Aft cyclic to initiate flare
  9. At 15-20 knots - Forward cyclic to level aircraft
  10. Collective - Gradually increase to soften landing
  11. On ground contact - Collective full down
  12. Wheel brakes - APPLY

3 Fire

3.1 Fire On The Ground

  1. Mixture - IDLE CUT-OFF
  2. Fuel Boost - OFF
  3. Fuel Selector - CLOSE
  4. Ignition - OFF
  5. External Power - Disconnect
  6. Battery-Generator - OFF
  7. Fire - Extinguish

3.2 In-Flight Engine Fire

  1. Collective - FULL DOWN
  2. Airspeed - 60 knots
  3. Throttle - CLOSED
  4. Mixture - IDLE CUT-OFF
  5. Fuel Boost - OFF
  6. Fuel Selector - CLOSE
  7. Ignition - OFF
  8. Cabin Occupants - ALERTED
  9. Tailwheel Lock - LOCKED
  10. Wheel brakes - OFF
  11. Shoulder harnesses - OFF
  12. At 75 feet - Aft cyclic to initiate flare
  13. At 15-20 knots - Forward cyclic to level aircraft
  14. Collective - Gradually increase to soften landing
  15. On ground contact - Collective full down
  16. Wheel brakes - APPLY

3.3 Electrical Fire

  1. Battery-Generator Switch - OFF
  2. Fire Extinguisher - DEPLOY

4 Main Gear Box Failure

4.1 Operation Over Land

If main gearbox oil press drops below 25 psi, or a main gearbox chip light illuminates, land immediately.

4.2 Operation Over Sea

If main gearbox oil press drops below 25 psi, or a main gearbox chip light illuminates, take the following actions based on the relevant situation.

4.2.1 If Close to Shore or Landing Site

Proceed at a slow rate of speed (50-60 knots) to minimize overheating.

4.2.2 If Gearbox Temperature Pegged
  1. Prepare to ditch
  2. Head toward nearest landing site
  3. Establish slow cruise (50-60 knots) to permit a quick flare followed by ditching at first sign of failure.
4.2.3 If Gearbox Temperature Above Redline but not Pegged
  1. Prepare to ditch
  2. Head toward nearest landing site
  3. Monitor gearbox oil pressure. If it drops establish slow cruise (50-60 knots) to permit a quick flare followed by ditching at first sign of failure.
4.2.4 Pressure Zero. Temperature within Limits

Note: This indication could be a malfunctioning pressure gauge.

  1. Prepare to ditch
  2. Head for nearest landing site
  3. Monitor gearbox oil pressure. Cruise speed and altitude may be higher than in previous two cases.
  4. If oil temperature rises establish slow cruise (50-60 knots) to permit a quick flare followed by ditching at first sign of failure.

5 Ditching

  1. Transmit Distress Signal
  2. Notify cabin passengers
  3. Have cabin occupants open the cabin door
  4. Open sliding windows in cockpit
  5. Order copilot to secure engine prior to entering the water
  6. Upon contact with water, continue to increase collective to slow rotor blade motion


6 Electrical Failures

6.1 Generator Failure

Indication - GEN WARN light illuminated

  1. Battery/Generator switch - Leave in BATT & GEN position to use only essential equipment
  2. Unneeded Equipment and Lights - OFF
  3. If equipment on secondary bus is needed, the Battery/Generator can be put in the BATT ONLY position, but battery power will be used more quickly.

6.2 No 1 Inverter Failure

Indication - INST PWR FAILURE light illuminated

  1. Instruments relying on AC power will be lost
  2. Instrument Power switch - NO 2 INV (if needed, and sufficient battery power)

6.3 No 2 Inverter Failure

Indication - Loss of ASE, radar altimeter and transponder.

Equipment on the bus cannot be powered in the event of a No 2 Inverter failure.

6.4 Bus shorts

Bus shorts will result in equipment on one or more busses going inoperative. Care should be taken due to the risk of an electrical fire.

  1. Battery/Generator - OFF (at pilot's discretion)
  2. Land - As soon as practical

7 Flight Servo Failures

  1. Affected servo - TURN OFF (PRI OFF or AUX OFF)
  2. Airspeed - below 60 knots
  3. Land - As soon as practicable
Retrieved from "https://shergoodaviation.com/wiki/index.php?title=H-34_Choctaw/Emergency_Procedures&oldid=2658"