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area containing the least number of trees of minimum
height. Decelerate to minimum forward speed at treetop
level and descend into the trees vertically. Apply all
remaining collective prior to the main rotor contacting
the trees.
9-58. DITCHING - POWER ON.
If ditching becomes necessary with power available,
accomplish an approach to a hover above the water
and:
1 . Doors - Jettison at a hover.
2. CPG or passenger - Exit.
9 - 2 6
3. Hover a safe distance away from personnel.
4. AUTOROTATE. Apply all remaining collective
as the helicopter enters the water. Maintain a
level attitude as the helicopter sinks and until
it begins to roll. Apply cyclic in the direction
of the roll.
5. Pilot - Exit when the main rotor stops.
9-59. DITCHING - POWER OFF.
In the event power is lost and ditching becomes
imminent, accomplish engine failure emergency
procedures and proceed as follows:
1 . AUTOROTATE - Decelerate to minimum
forward speed as helicopter nears the water.
Apply all remaining collective as the
helicopter enters the water. Maintain a level
attitude as the helicopter sinks and until it
begins to roll. Apply cyclic in the direction of
roll.
2. Doors - Jettison as the helicopter enters the
water.
3. CPG or passenger and pilot - Exit when
main rotor stops.
9-60. FLIGHT CONTROL.
9-61. FLIGHT CONTROL MALFUNCTIONS.
Failure of flight control components may be indicated
by varying degrees of feedback, binding, resistance, or
sloppiness. If one or more of these symptoms occur, it
should not be mistaken for hydraulic power failure.
Should a flight control malfunction occur:
1. LAND AS SOON AS POSSIBLE.
2. EMER SHUTDOWN after landing.
9 - 6 2 . S T A B I L I T Y A N D C O N T R O L
AUGMENTATION SYSTEM (SCAS) FAILURE.
Failure of the SCAS system will be evidenced by
display of the P/R DISENG, YAW DISENG, and/or
SCAS DISENG caution(s). In the event of a P/R or yaw
SCAS failure, or both, the respective actuator(s) will
center and lock within approximately 0.5 second. When
a failure is detected, the respective channel switch(es)
will move to the OFF position, disabling the affected
axis (or axes). In the event a failure occurs at a time
when an actuator is not centered, a slight bump will be
felt by the operator through the flight control as the
actuator centers. SCAS failure will result in an increase
in pilot workload but continued flight is possible.
2 .
In the event of a SCAS disengagement, proceed as
follows:
9-63.
1. Affected SCAS channel - Attempt to
reengage.
If SCAS cannot be reengaged:
9-64.
TM 1-1520-248-10
LAND AS SOON AS PRACTICABLE.
LIGHTNING STRIKE.
LAND AS SOON AS POSSIBLE.
IN-FLIGHT WIRE STRIKE.
LAND AS SOON AS POSSIBLE.
SECTION II. MISSION EQUIPMENT
9-65. MISSILE UNLATCHED. CAUTION
1. Avoid nose low attitudes and excessive bank
angles.
2. LAND AS SOON AS PRACTICABLE.
If a HELLFIRE launcher is jettisoned with
a single missile on the inboard launcher
rail, the launcher may contact the landing
gear skid tube.
9-66. MISFIRE - 2.75-INCH ROCKET.
A misfire is a rocket that has been fired but the launch
motor does not ignite.
Proceed as follows:
In the event of missile hangfire proceed as follows:
1. JETTISON switches(es) - Activate. (Only in
event of residual fire.)
2. LAND AS SOON AS POSSIBLE.
1. Position the aircraft so that rocket is oriented
downrange for a period of 10 minutes.
2. Upon landing the aircraft - Notify explosive
ordnance disposal.
9-68. RUNAWAY GUN.
Gun continues to fire after WPN-FIRE switch is
released.
Proceed as follows:
9-67. ROCKET/MISSILE - HANGFIRE.
A hangfire is an event when a rocket or missile motor
ignites and produces thrust but hangs up on/in the
launcher and does not separate from the helicopter.
The resulting missile thrust is transferred to the
helicopter and may cause control difficulty and potential
structural damage. HELLFIRE missile thrust lasts for
approximately 2.5 seconds. Control of the aircraft is
crucial during this period and recovery is dependent
upon altitude and obstacles. Failure to immediately
counter missile thrust with control inputs may cause
loss of aircraft control.
1. Orient gun in a safe direction.
2. MASTER switch - STBY.
3. Allow gun to fire out.
4. Gun switch - SAFE.
9-69. CARGO HOOK FAILS TO RELEASE
ELECTRICALLY.
WARNING
In the event that cargo hook will not release sling when
CARGO RELEASE switch is pressed, proceed as
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OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPTER 2(95)
