PHI GOM S92 Gear Box EPs

Question 0

MGB CHIP

or ACC1 or ACC 2 CHIP

Answer 0

FLY… Land as soon as Practical.
(POSSIBLE if both are on)
Identify.- MAIN GEAR Box or ACCESSORY CHIP CAUTION.
Checklist. Tab 10

Question 1

MGB OIL PRESS Caution Light
or
MGB OIL HOT Caution Light

Answer 1

FLY…descend at:
15% torque,
80 to 100 knots to 500 feet,
2° nose up maintain.

Identify.- MGB OIL PRESS/TEMP CAUTIONS.
Checklist.-Tab 10

Question 2

LIMIT EXCEEDED

Answer 2

FLY…. Land as soon as PRACTICAL.
Identify.- LIMITED EXCEEDED.
Checklist.- Tab 10

Question 3

MGB OIL PRESS [RED WARNING]

MGB PUMP 1 or 2 FAIL and MGB BYPASS
MGB Oil Press is 7 p.s.i or greater

Answer 3

FLY...descend at:
 15% torque, 
80 to 100 knots 
to 500 feet, 
2° nose up maintain.
Land as Soon as Possible.

Identify.-MAIN GEAR BOX OIL
PRESSURE WARNING. (auto bypass)
(a pump has failed only. no leak),
Checklist. Tab 11

(If you spend too much time reading the checklist the INPUT/ACC 1/2 HOT will also come on. This will be corrected by the MAN COOL step.)

(THROTTLE- will be set to Idle in the checklist but may use dual engine power for landing)

Question 4

What component failures may occur as a result of loss of Main transmission fluid

Answer 4

Main gearbox failure,
Loss of AC generators-(Start the APU),
Hydraulic Pump,
Input Module,
Accessory Module,
Tail Rotor drive,

Question 5

Immediate action step for “GEARBOX OIL OUT” aural alert

Answer 5

Land IMMEDIATELY

Question 6

INPUT 1 CHIP

no MGB PRES caution or warning

Answer 6

FLY..adjust to OEI profile,
Land as soon as POSSIBLE.

Identify.- INPUT CHIP CAUTION.

Checklist.- Tab 10

(THROTTLE- will be set to Idle in the checklist but you may use dual engine power for landing)

Question 7

MGB OIL PRESS [RED WARNING]
MGB PUMP 1 or 2 FAIL and MGB BYPASS
MGB Oil Press is 7 psi or greater

What if you add one of the dynamic secondaries below:

Increased power required at constant collective setting and airspeed.
Yaw kicks.
Unusual noise or vibrations.
Loss of two hydraulic pumps.
"GEARBOX OIL OUT" aural alert

Answer 7

Emergency descent

FLY…descend at:
15% torque,
80 to 100 knots to 500 feet,
2° nose up maintain.

If you get one of the Dynamic secondaries:

Land IMMEDIATELY .

Identify.-MAIN GEAR BOX OIL PRES/TEMP CAUTIONS.
Checklist Tab 11

Question 8

INPUT, or ACC 1 HOT

or MGB PUMP 1 FAIL

Answer 8

FLY….at 80 to 100 knots (setup for OEI),
2° nose up,
Land as soon as POSSIBLE
Identify.- INPUT/ACC HOT or MGB PUMP FAIL.
Checklist- Tab 11

Question 9

IGB OIL LEVEL
(or TGB OIL LEVEL)
On deck only

Answer 9

Service gearbox before start

Question 10

TGB CHIP

or TGB HOT, IGB CHIP, IGB HOT

Answer 10

FLY….
80 knots,
Land as soon as POSSIBLE

(IMMEDIATELY with dynamic secondary’s or both HOT & CHIP)

Identify.- TAIL/INTERMEDIATE OIL HOT/CHIP.
Checklist- Tab 12

Question 11

S/P TEMP DETECT

Answer 11

FLY… Land as soon as PRACTICAL.
Identify.- SWASHPLATE TEMPERATURE DETECT.
Checklist.- Tab 12

Question 12

S/P TEMP LIMIT
and
“SWASHPLATE TEMPERATURE” audio

Answer 12

FLY…Land as soon as POSSIBLE.

(IMMEDIATLY with dynamic secondary’s )

Identify.- SWASHPLATE TEMPERATURE LIMIT.
Checklist.- Tab 12

Question 13

Why is the engine brought to idle with a MGB PUMP 1 or 2 FAIL

Answer 13

The failed pump is no longer scavenging oil from the accessory module. To reduce heat and potential frothing of excess oil, we reduce the load on that side thus reducing oil flow rate. (info from training)

Question 14

MGB PUMP 1 FAIL, 
MGB PUMP 2 FAIL, 
MGB OIL HOT, 
MGB MAN COOL,
MGB OIL PRESS

Answer 14

Fly…
Identify.- FALSE MGB INDICATIONS.

Reset the “M XMSN OIL WARN” circuit breaker once.
MGB Bypass switch will need to be cycled MAN cool back to AUTO position.
Best Pract 8

Question 15

Immediate action step for “Main Gearbox PRESSURE” aural alert (not “out”)

Answer 15

FLY…descend at:
15% torque,
80 to 100 knots to 500 feet,
2 ° nose up maintain.

Question 16

MGB out WARNING,
and,
“Main gear box OUT” aural alert are activated when….

Answer 16

Input manifold pressure is below 5 p.s.i.
and
Last jet below 24 p.s.i.

(can’t have the Warning without the audio alert)