Engine Shutdown

Question 1

N N 16. APU CONT switch — ON. The APU ON, BACK UP PUMP ON, and APU ACCUM LOW advisories — Appear.

Answer 1

• If external electrical power is required for shutdown, it shall be connected and EXT PWR switch placed to RESET.
• If ac power is not available, complete normal shutdown on No. 2 engine before continuing.

Question 2

W C 21. ENG POWER CONT levers — IDLE.

Answer 2

Restrict the rate of ENG POWER CONT lever’s movement, when the tailwheel lockpin is not engaged. Rapid application of ENG POWER CONT levers can result in turning the helicopter, causing personnel injury or loss of life.

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 centered.

Question 3

C N 24. Droop stops — Verify in, about 50% NR.

Answer 3

To prevent damage to anti-flap stops, do not increase collective pitch at any time during rotor coast down.

If one or more droop stops do not go in during rotor shutdown, shut down an engine to lower rotor idling NR in an attempt to seat the droop
stops. If droop stops still do not go in, accelerate rotor to above 75% NR. Repeat rotor shutdown 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 keeping cyclic in neutral position.

Question 4

C 28. ENG POWER CONT lever(s) — OFF after 2 minutes at NG of 90% or less.

Answer 4

Before moving ENG POWER CONT lever OFF, engine must be cooled for 2 minutes at an NG 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 cannot be done within 5 minutes, the engine should be allowed to cool for 4 hours before attempting an engine start.

Question 5

N N 32. DEC/EDECU signal validation fault codes — Check.

Answer 5

• Loss of aircraft power to DEC/EDECU will generate no fault codes.
• After the prescribed fault code has displayed as a Q value, the DEC/EDECU codes may be found in the FMS status pages by selecting the following:

a. STS fixed function — Press.
b. SK-4 AIR-VEHICLE — Press.
c. SK-3 DEC-1 for fault on #1 Q — Press,
or SK-8 DEC-2 for fault on #2 Q — Press.
d. Read actual fault.

Question 6

N 38. GENERATORS APU switch — OFF.

Answer 6

Wait 15 seconds before turning off the APU generator after EGI 1 and EGI 2 switches are turned off.