14.
Flight controls -Hold.
During shutdown ensure that cyclic is kept in neutral or displaced slightly into prevailing wind, collective no more than one inch above full down and pedals cen-tered.
Restrict the rate of ENG POWER CONT lever movement, when the tailwheel lock-pin is not engaged. Abrupt application of ENG POWER CONT lever can result in turning the helicopter.
15. ENG POWER CONT levers -IDLE.
16.
ENGINE IGNITION switch -OFF.
17.
Cyclic -As required to prevent anti-.ap pound-ing.
18.
Droop stops -Verify in, about 50% RPM R.If one or more droop stops do not go in during rotor shutdown, shut down an engine to lower rotor idling RPM in an attempt to seat the droop stops. If droops still do not go in, accelerate rotor to above 75% RPM R. Repeat rotor shut-down procedures, slightly displacing cyclic in an attempt to dislodge jammed droop stop. If droop stops still do not go in, make certain that rotor disc area is clear of personnel and proceed with normal shutdown procedures while keep-ing cyclic in neutral position.
To prevent damage to anti-.ap stops, do not increase collective pitch at any time during rotor coast-down.
19. BACKUP HYD PUMP switch -OFF.
20.
Stabilator -Slew to 0° after last .ight of the day.
21. BACK-UP PUMP ON advisory legend -Check off.
Before moving ENG POWER CONT le-ver OFF, engine must be cooled for 2 minutes at an Ng SPEED of 90% or less. If an engine is shut down from a high power setting (above 90%) without being cooled for 2 minutes, and it is necessary to restart the engine, the restart should be done within 5 minutes after shutdown. If the restart can not be done within 5 min-utes, the engine should be allowed to cool for 4 hours before attempting an engine restart.
22. ENG POWER CONT levers -OFF after 2 minutes at Ng SPEED of 90% or less.
23.
ENG FUEL SYS selectors -OFF.
24.
TGT TEMP -Monitor. If TGT TEMP rises above 538°C:
a.
Start button -Press.
b.
ENG POWER CONT lever(s) -Pull after TGT TEMP is below 538°C.
25.
Avionics -Off.
26.
Deleted.
Change 4 8-17
27. MFDs -Off. 31. APU CONTR switch -OFF.
28. Overhead switches -As required: 32. BATT switch -OFF.
a. ANTICOLLISION/POSITION 8.34 BEFORE LEAVING HELICOPTER.
LIGHTS.
1. Walkaround -Complete, checking for damage,
b. Left panel light controls. .uid leaks and levels.
c. WINDSHIELD WIPER. 2. Mission equipment -Secure.
d. VENT BLOWER. 3. DC-902 data cartridge -Remove.
e. Right panel light controls. 4. Complete log book forms.
29. APU generator switch -OFF. 5. Secure helicopter -As required.
30. FUEL PUMP switch -OFF.
Section III INSTRUMENT FLIGHT
8.35 INSTRUMENT FLIGHT.
Refer to FM 1-240 for instrument .ying and navigation techniques.
Section IV FLIGHT CHARACTERISTICS
8.36 GENERAL.
a.
Refer to FM 1-203 Fundamentals of Flight for expla-nation of aerodynamic .ight characteristics.
b.
The safe maximum operating airspeed range is de-scribed in Chapter 5. While hovering in high wind, sideward and rearward .ight should be limited to low ground speeds. The helicopter is directionally stable in for-ward .ight. In sideward and rearward .ight, directional control is more difficult. During approach, or slow .ight as the airspeed reaches about 17 to 20 KIAS, a mild vibration will be felt.
8.37 GROUND RESONANCE.
Ground resonance is a self-excited vibration created when a coupling interaction occurs between the movement of the main rotor blades and the helicopter. For this to happen, there must be some abnormal lead/lag blade con-dition which would dynamically unbalance the rotor and a reaction between the helicopter and ground, which could aggravate and further unbalance the rotor. Ground reso-nance can be caused by a blade being badly out of track, a malfunctioning damper, or a peculiar set of landing condi-tions. Ground resonance may occur when a wheel reaction aggravates an out-of-phase main rotor blade condition such as a hard one-wheel landing, resulting in maximum lead and lag blade displacement. This helicopter does not have a history of ground resonance. If it should occur, get the he-licopter airborne. If this is not possible, immediately reduce collective pitch, place ENG POWER CONT levers OFF, and apply wheel brakes.
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