4.
If four or less satellite vehicles are used verify the DGNS navigator mode has automatically changed from its present NAV mode in the header of DG or GP to DOP.
5.
If DGNS did not automatically change to a dif-ferent mode, go to NAV page. Manually se-lect GPS or DOP mode.
6.
Verify present position is updating.
7.
Monitor nav sensor alert in status line. If GPS reinitializes itself, change mode to DO-GPS,as desired.
9-22
TM 1-1520-253-10
Section II MISSION EQUIPMENT
9.33 EMERGENCY JETTISONING.
When conditions exist which require the jettisoning of external loads to ensure continued .ight or execution of emergency procedures, the crew should jettison the load as follows:
CARGO REL or HOOK EMER REL button -Press.
9.34 EMERGENCY RELEASE OF RESCUE HOIST LOAD.
If the rescue hoist becomes jammed, inoperative, or the cable is entangled and emergency release is required:
9.34.1 HOIST CABLE CUT.
On either pilot’s or crew panel:
NOTE
Crew’s hoist control panel ARM-TEST switch must be in ARM to cut cable from either position.
CABLE CUT button -Press.
9.34.2 HOIST RUNAWAY.
1. Pilot’s hoist control panel PILOT OVER-RIDE switch UP or DOWN to control, as re-quired.
If control is not possible:
2. Pilot’s hoist panel HOIST POWER switch -OFF.
9.35 BLADE DEICE SYSTEM MALFUNCTIONS.
9.35.1 MR DE-ICE FAULT or MR DE-ICE FAIL, or TR DE-ICE FAIL Caution Legend On.
a.
If the MR DE-ICE FAULT caution legend goes on, the system will continue to function in a degraded mode. The pilot must be aware of vibration levels and % TRQ requirements, which could be a result of ice buildup.
b.
If the MR DE-ICE FAIL caution legend goes on, the main rotor deice will automatically turn off. Tail rotor deice will remain on.
c. If the TR DE-ICE FAIL caution legend goes on, tail rotor deice will automatically turn off. Main rotor deice will remain on.
1. Icing conditions -Exit. BLADE DEICE POWER switch -OFF, when
out of icing conditions.
If vibrations increase:
3. LAND AS SOON AS POSSIBLE.
9.35.2 PWR MAIN RTR and/or TAIL RTR MONITOR Light On.
If a PWR monitor light is on with BLADE DEICE POWER switch ON to stop power from being applied to blades:
1. Icing conditions -EXIT. BLADE DEICE POWER switch -OFF. If a PWR monitor light is still on with BLADE DEICE POWER switch OFF:
GENERATORS NO. 1 or NO. 2 switch -OFF.
APU generator switch -OFF (if in use).
5. LAND AS SOON AS PRACTICABLE.
9.35.3 Ice Rate Meter Fail or Inaccurate. Failure of the ice rate meter should be indicated by appearance of the FAIL .ag on the meter face. Inaccuracy of the meter will be indicated by increased torque required and/or increase of vibration levels due to ice buildup. If failure or inaccuracy is suspected, with no other indicated failures, the system can be manually controlled.
BLADE DEICE MODE switch -MANUAL as required.
If vibration levels increase or % TRQ required increases:
Higher icing MODE -Select as required.
If ice buildup continues:
3. LAND AS SOON AS PRACTICABLE.
9-23
TM 1-1520-253-10
9.35.4 Loss of NO. 1 or NO. 2 Generator During Blade Deice Operation. Loss of one generator during blade deice operation will result in loss of power to the system. To restore system operation, the APU must be started and the APU generator switch ON. The APU GEN ON advisory legend will not go on because one main gen-erator is still operating. The APU generator will supply power only for blade deice operation.
Pilot not on the controls:
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