Main/tail Rotor

Question 1

Symptom:

1. If NR greater than or equal to 380 rpm (10 Hz chopped tone)

Answer 1

NR OVERSPEED

Corrective Action:

1. REDUCE NR TO WITHIN LIMITS, WHEN ABLE.

If NR less than 420 rpm:
2. continue flight as appropriate.

If NR greater than or equal to 420 rpm:
2. land as soon as practicable.

Question 2

Symptoms:

1. NR HI caution light illuminated with NR switch in NORMAL.
2. NR greater than or equal to 365 rpm with the NR switch in NORMAL.

Answer 2

VARIABLE NR MALFUNCTION

Corrective Action:

1. airspeed - less than 135 KIAS.
2. angle of bank - 40 degrees maximum.
3. abort mission.

Question 3

Symptoms:

1. NR gauge fluctuates abnormally or indicates zero.

Answer 3

NR INDICATING SYSTEM FAILURE

Corrective Action:

1. monitor operable NR indicator or CDU ASE page.
2. continue flight as appropriate.

If both NR gauges fail and no NR indication on CDU:
3. abort mission.

Question 4

Symptom:

1. Any uncommanded left yaw not attributable to mechanical failure of the tail rotor drive system.

Answer 4

UNCOMMANDED LEFT YAW (ULY)

Corrective Action:

1. IMMEDIATE FULL RIGHT PEDAL
2. ALTITUDE/OBSTACLE PERMITTING, SMOOTHLY APPLY FORWARD CYCLIC TO INCREASE FORWARD AIRSPEED.
3. ALTITUDE PERMITTING, REDUCE COLLECTIVE.
4. NR SWITCH - HIGH.

Question 5

Symptom:

1. GB CHIP warning light illuminated and a TGB CHIP annunciation on the VEMD caution/fuel page.

Answer 5

TGB CHIP

Corrective action:

1. ESTABLISH SAFE ALTITUE/AIRSPEED FOR POSSIBLE LOSS OF TAIL ROTOR THRUST.
2. LAND AS SOON AS POSSIBLE.

Question 6

Possible symptoms:

1. GB CHIP warning light illuminated (loss of thrust) with a TGB CHIP annunciation on the VEMD caution/fuel page.
2. uncommanded yaw to the left or right.
3. tail rotor pedals moveable without effect ( loss of thrust).
4. abnormal vibrations or noise from the tail section ( loss of thrust or fixed pitch).
5. cannot move pedals ( fixed pitch).

Answer 6

LOSS OF TAIL ROTOR THRUST IN FORWARD FLIGHT OR FIXED TAIL ROTOR PITCH

Corrective Action:

1. DIRECTIONAL CONTROL - MAINTAIN USING CYCLIC AND COLLECTIVE.
2. land as soon as practicable. Utilize the appropriate procedure for landing with a tail rotor malfunction.

Question 7

POWERED LANDING WITH TAIL ROTOR MALFUNCTION:

Answer 7

1. Landing/hover checklist - complete.
2. approach angle/speed - as required to maintain right yaw ( left sideslip).
3. touchdown - aligned with runway, eliminate yaw and drift.
4. rollout - coordinate cyclic and collective to maintain directional control and reduce ground speed.
5. brakes - apply as required.

Question 8

Symptom:

1. IMMEDIATE, rapid left yaw acceleration.

Possible symptoms:

2. tail rotor pedals moveable but with no apparent effect.
3. abnormal vibrations or noise from the tail section.
4. GB CHIP warning light illuminated and a TGB CHIP annunciation on the VEMD caution/fuel page.

Answer 8

LOSS OF TAIL ROTOR THRUST WHILE HOVERING

Corrective Action:

1. ESFL - BOTH OFF.
2. MAINTAIN LANDING ATTITUDE.
3. COLLECTIVE - CUSHION THE LANDING.