TM 1-1520-253-10
SVO OFF switch on either collective control head in 1ST STG or 2ND STG position. Before initiating emergency procedure action, the pilots should check that both SVO OFF switches are centered.
LAND AS SOON AS POSSIBLE.
9.27.6 #1 RSVR LOW and #1 HYD PUMP Caution Legends On With BACK-UP PUMP ON Advisory Legend On.
1. LAND AS SOON AS PRACTICABLE.
If the BACK-UP RSVR LOW caution legend also goes on:

2. SVO OFF switch -1ST STG.

If #2 PRI SERVO PRESS caution legend goes on, establish landing attitude, mini-mize control inputs and begin a descent.
3. LAND AS SOON AS POSSIBLE.
9.27.7 #2 RSVR LOW and #2 HYD PUMP Caution Legends On With BACK-UP PUMP ON Advisory Legend On.

1. POWER ON RESET switches -Simulta-neously press then release.
2. LAND AS SOON AS PRACTICABLE. If BACK-UP RSVR LOW caution legend also goes on:

3. SVO OFF switch -2ND STG.

If #1 PRI SERVO PRESS caution legend goes on, establish landing attitude, mini-mize control inputs, and begin a descent.
4. LAND AS SOON AS POSSIBLE.
9.27.8 #2 RSVR LOW Caution Legend On.
Pilot assist servos will be isolated; if they remain iso-lated, proceed as follows:
Change 4 9-17 TM 1-1520-253-10

1. BOOST and FPS switches -Off.

2.
LAND AS SOON AS PRACTICABLE.

NOTE
Because the logic module will close valves supplying pressure to the pilot-assist servos, BOOST SERVO OFF, SAS OFF, and TRIM FAIL caution legends will be on.

9.27.9 Collective Boost Servo Hardover/Power Piston Failure. Hardover failure of the collective boost servo will increase control forces (as much as 150 pounds) in the collective. The increased control forces can be im-mediately eliminated by shutting off the boost servo. Re-sulting control loads will be the same as for in-.ight boost servo off.

1. BOOST switch -Off.

2.
LAND AS SOON AS PRACTICABLE.

9.27.10 Pitch Boost Servo Hardover. Hardover fail-ure of the pitch boost servo will increase the longitudinal cyclic control forces (approximately 20 pounds). The in-creased control forces can be immediately eliminated by shutting off SAS.

1. SAS (1 and 2) and FPS switches -Off.

2.
LAND AS SOON AS PRACTICABLE.

9.27.11 BOOST SERVO OFF Caution Legend On.
Lighting of the BOOST SERVO OFF caution legend with no other caution legends on indicates a pilot valve jam in either the collective or yaw boost servo. Control forces in the affected axis will be similar to .ight with boost off.

1. BOOST switch -Off.

2.
LAND AS SOON AS PRACTICABLE.

9.28 LANDING AND DITCHING.

9.28.1 Emergency Landing In Wooded Areas. Power Off.
1.
AUTOROTATE. Decelerate helicopter to stop all forward speed at treetop level.

2.
Collective adjust to maximum before main ro-tor contacts tree branches.

9-18 Change 4

9.28.2 Ditching -Power On. The decision to ditch the helicopter shall be made by the pilot when an emergency makes further .ight unsafe.
1.
Approach to a hover.

2.
Cockpit doors jettison and cabin doors open prior to entering water.

3.
Pilot shoulder harness -Lock.

4.
Survival gear -Deploy.

5.
Personnel, except pilot, exit helicopter.

6.
Fly helicopter downwind a safe distance and hover.

7.
ENG POWER CONT levers -OFF.

8.
Perform hovering autorotation, apply full col-lective to decay rotor RPM as helicopter settles.

9.
Position cyclic in direction of roll.

10.
Exit when main rotor has stopped.

9.28.3 Ditching -Power Off. If ditching is imminent, accomplish engine malfunction emergency procedures. During descent, open cockpit and cabin doors. Decelerate to zero forward speed as the helicopter nears the water. Apply full collective as the helicopter nears the water. Maintain a level attitude as the helicopter sinks and until it begins to roll; then apply cyclic in the direction of the roll. Exit when the main rotor is stopped.
　
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