MGB/TGB

Question 1

MGB FAILURE IMMINENT

Answer 1

Two or more of the following symptoms:
● Loss of MGB lubrication indicated on the EICAS page by
– MGB OIL P
– MGB PMP MAIN
– MGB PMP AUX
– MGB oil pressure at zero
– Possible rise in MGB oil temperature
● MGB CHIP
● Yaw kicks, abnormal MGB noises, or unusually high power
requirements.
Corrective action:

1. LAND/DITCH IMMEDIATELY

                  WARNING The potential loss of the airframe after aircrew egress is not sufficient cause to continue flight.

Question 2

MGB MALFUNCTION

Answer 2

One of the following symptoms:
● Drop in MGB oil pressure indicated on the EICAS page by:
– MGB OIL P
– Low MGB oil pressure.
– Possible rise in MGB oil temperature
● Loss of MGB lubrication indicated on the EICAS page by:
– MGB OIL P
– MGB PMP MAIN
– MGB PMP AUX
– MGB oil pressure at zero
– Possible rise in MGB oil temperature
● MGB CHIP
● MGB oil pressure greater than 80 psi
● Abnormal MGB noises

Corrective action:

1. Monitor for secondary indications
2. Fly at minimum safe altitude
3. Avoid high power maneuvers
4. LAND AS SOON AS PRACTICABLE

                    NOTE ● Single malfunctions while serious do not indicate that a MGB failure is imminent. Flight without MGB oil lubrication should be sustainable for approximately 25 minutes. ● In order to determine whether or not torque requirements have increased for a MGB problem, the pilot should note and verbalize the flight regime, airspeed, and current torque setting at the onset of the malfunction to establish a baseline for later comparison.

Question 3

TGB CHIP

Answer 3

Symptom:
● TGB CHIP
Corrective action:

                    WARNING Pilots shall establish a safe altitude and airspeed for possible loss of tail rotor thrust.

1. LAND AS SOON AS POSSIBLE
   NOTE

If accompanied by strong medium frequency vibrations or abnormal noise from the tail section, plan your approach for the possible loss of tail rotor thrust.