PHI GOM S92 Electrical EP's

Question 0

AC GEN 1 FAIL AND AC GEN 2 FAIL

Answer 0

FLY…(Use Standby instruments to maintain attitude if IMC. Same indications as battery on only during morning runup.
ID- DUAL AC GENERATOR FAILURE
Checklist- TAB 15

Question 1

AC GEN 1 FAIL

Answer 1

FLY….
ID- SINGLE AC GENERATOR FAILURE
CHECKLIST- TAB 15

Depending on how long the Bus-tie relay takes to switch over you may drop some components temporarly (AFCS, RADAR, MFDs). If the APU GCU also fails, don’t continue offshore since you will have no way to start the aircraft after inspection.

Question 2

AC GCU 1 FAIL

Answer 2

FLY….
ID- AC GENERATOR CONTROL FAILURE
CHECKLIST- TAB 16

Question 3

DC CONV 1 and 2 FAIL Symptoms

Answer 3

FLY…
ID- Dual DC CONVERTER FAILURE
CHECKLIST- TAB 16

Question 4

Without the APU GEN online what approaches and comms are available with DUAL AC GEN FAILURE

Answer 4

RTU 1

GCA approach only (no self NAV available

Question 5

DC CONV 1 FAIL, DC CONV 2 FAIL, BACKUP CONV FAIL. initial action

Answer 5

Turn backup CONV off to regain ICS.

The ICS is powered through the Battery bus. With the backup converter switch on, the battery bus is connected to the backup converter. Turning off the Backup converter switch allows the Battery bus to be powered by the battery again instead of the inoperative backup converter.

Question 6

BATTERY HOT note:

Answer 6

May not have sufficient power for subsequent APU start. BATT CHARGE FAIL (since battery will be discharged through the Battery Bus to reduce heat)

Question 7

How long does the APU take to start (after a dual AC failure?

Answer 7

About 19 long seconds