H-34 Choctaw/Normal Procedures

SECTION 6. NORMAL PROCEDURES

1 General

This section describes the procedures necessary to safely and efficiently operate your aircraft. A basic understanding of helicopter flight techniques is assumed.

3 Normal Start-Up

3.1 Prestart

1. Rotor Brake – ON
2. Anti-collision lights – AS REQUIRED
3. Cabin lights – AS REQUIRED
4. All Light Rheostats - AS REQUIRED
5. Cabin Heater Switch - OFF
6. Fan Switch - OFF
7. Pitot Heater Switch - OFF
8. Windshield Wiper Rotary Switch - OFF
9. Crew Alarm Bell - TEST
10. Hoist Master Switch - OFF
11. Radio Master Switch - RADIO MASTER
12. Circuit Breakers - IN
13. Stick Trim Switch – ON
14. Fuel Shutoff Valve - Open
15. Mixture Control Lever - IDLE CUT-OFF
16. Carburetor Air Lever - DIRECT
17. Clutch Pump Switch - OFF
18. Servo Switch – ON
19. Parking Brake Handle - RESET
20. Tail Wheel - LOCKED
21. Radios, Radar Altimeter, IFF - OFF
22. Ignition Switch - OFF
23. Fuel Booster Pump Switch - OFF
24. External Power - ON (voltage checked)
25. Battery-Generator Switch - BATT ONLY (voltage checked)
    Note: When starting without external power, the battery-generator switch must be in the BATT ONLY position to energize the starter relay and engine primer which are connected to the secondary bus.
26. Fuel Pressure – Check
    1. Fuel Shut-Off Switch - CLOSED
    2. Fuel Pressure Gage - ZERO PSI
    3. Fuel Shut-Off Switch - OPEN
    4. Fuel Pressure Gage - Check for Fuel Pressure Increase
    5. Fuel Booster Switch- FUEL BSTR PUMP
27. Clutch Pump Warning Light - TEST
28. Instr. Pwr. Failure Warning Lights - TEST
29. Fuel Low Level Warning Light - TEST
30. Rotor Brake Warning Light - TEST
31. Generator Warning Light - TEST
32. Collective - DOWN
33. Throttle – CLOSED

3.2 Starting Engine

1. Starter Button – DEPRESS
2. Ignition Switch – BOTH (after engine has cranked for approximately 5 sec.)
3. Primer Button – DEPRESS
   NOTE: If engine fails to start after 30 seconds, allow the starter to cool and then repeat starting procedure
4. Mixture Control Lever – RICH
5. Engine – Verify running smoothly
   NOTE: Do not allow the engine to exceed 1400 RPM on starting.
   CAUTION: To prevent possible engine damage, if oil pressure does not register within 10 sec. or reach 40psi within 20 sec., stop engine and investigate.
6. Starter and Primer – OFF
7. Idle Engine at 1000 +- 100 rpm until oil pressure has stabilized
8. Aux. Hyd. Press. - 1300 to 1600 psi

3.3 Post-Start

1. Oil Pressure – CHECK
2. Ignition Switch – CHECK
   Idle engine at 1000 +- 100 rpm. Turn switch OFF momentarily to see if engine stops firing. Return switch to BOTH.
3. Throttle – 1400 RPM
   as soon as engine runs smoothly on RICH MIXTURE and oil pressure has stabilized.
4. Flight Control Servo – AUX OFF
   1. Check that auxiliary servo hydraulic pressure remains constant.
   2. Check controls for free and easy movement.
      NOTE: The auxiliary servo hydraulic system should not shut off when the switch is placed in the AUX OFF position, as there is no pressure in the primary servo hydraulic system until after clutch engagement.
5. Flight Control Switch – ON
6. Carburetor Air Lever – DIRECT
7. Manifold Pressure Drain Valve – PRESS
8. Fuel Gage Test Switch – TEST
9. Fuel Quantity Selector – CHECK ALL
   Rotate through the four positions, TOT, FWD, CTR, AFT, to check fuel quantity in each tank. Leave switch at FWD position.
10. Engine temp. and press. – CHECK

3.4 Engage

1. Oil Temp – >40C
2. Rotor Brake Lever - OFF
3. Rotor Brake Warning Light – OFF
4. Collective Pitch Stick – MINIMUM PITCH
5. Cyclic Control Stick – CENTERED
6. Tail Rotor Control Pedals – CENTERED
7. Throttle – 1700 Engine RPM
8. Clutch Switch – CLUTCH
   Verify clutch switch warning light - ON
9. Throttle – Increase to 2000 to 2400 engine rpm to produce 1525 apparent rotor rpm
10. Apparent Rotor Speed – 1525 RPM
11. Engine – cut quickly to below rotor speed, then increase to match needles
    Note: Do not let apparent rotor RPM fall below 1200 RPM or mechanical coupling will not engage.
    Note: As throttle is increased, the rotor and engine tachometer needles should line up, indicating that the clutch mechanical coupling has engaged.
12. Clutch Switch – OFF
13. Clutch Warning Light – Verify OFF
14. Trans. Temp. and Press – CHECK
15. Engine – 2000 RPM
16. Pri. Hyd. Press. - 1300 to 1600psi

3.5 Post-Engage

1. Battery-Generator Switch - BATT & GEN
2. External Power – OFF
3. Radios, Radar Altimeter, IFF – ON
4. Instrument Power Switch – No 2 INV
5. INST PWR FAIL light – Verify OFF
6. Instrument Power Switch – No 1 INV
7. Flight Instruments - Check
8. Engine Driven Fuel Pump Check
   1. Fuel Booster Pump Switch – OFF
      NOTE: A drop of approximately 10 amps should result indicating that the fuel booster pump is shut off. Engine should remain running on engine driven pump.
   2. Fuel Pressure Gage - 22 1/2 to 23 1/2 psi
   3. Fuel Booster Pump Switch – ON
9. Warning Lights – OFF
10. Hydraulic Hoist – CHECK
11. Hoist Master Switch – PILOT
12. Hoist Switch – DN, OFF, UP
13. Hoist Master Switch OFF
14. Servo Checks
    1. Flight Control Servo - PRI OFF
    2. Pri. Hyd. Press – Verify 0 psi
    3. Flight Control Servo – ON
    4. Pri. Hyd. Press – Verify normal psi
    5. Flight Control Servo - AUX OFF
    6. Aux. Hyd. Press – Verify 0 psi
    7. Flight Control Servo – ON
    8. Aux. Hyd. Press – Verify normal psi
15. Mixture Check
    1. Mixture Control Lever – NORMAL
    2. Engine – Verify normal operation
    3. Mixture Control Lever - RICH
16. Ignition System Check
    1. Engine – 2200 RPM
    2. Ignition – R then L (max drop 75 RPM)
    3. Ignition – BOTH
17. Freewheeling Unit Check
    1. Engine – 2200 RPM
    2. Cut throttle rapidly – verify RPM split
    3. Engine – 2200 RPM

6 Cruise

RANGE
CONFIGURATION: CLEAN

GROSS WEIGHT POUNDS	PRESS ALT FEET	ENG RPM	MAN PRESS
13,500	12,000
	10,000
	8,000	2500	36.4
	6,000	2500	36.2
	4,000	2500	38.1
	2,000	2500	39.1
	SL	2300	34.3
12,000	12,000	2400	32.0
	10,000	2500	32.0
	8,000	2500	32.5
	6,000	2500	32.4
	4,000	2300	32.5
	2,000	2300	33.1
	SL	32.4