B747 relief pilot reported being summoned from the bunk room after the flying first officers air dat...

Attributes
ACN	1345274
Time
Date	201603
Local Time Of Day	1201-1800
Place
Locale Reference	EDVV.ARTCC
State Reference	FO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B747 Undifferentiated or Other Model
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Air Data Computer
Person 1
Function	Pilot Not Flying Relief Pilot
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 20000 Flight Crew Type 9000
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter Fuel Issue

Narrative:

I was one of the relief pilots on this flight. Approx. 2 hr's after push back; myself and the other relief pilot was awoken from our required rest. After entering the cockpit we were informed that the first officer's air data computer (air data computer) failed and we were returning. We were informed of what the flying pilots had done and we discussed what else we needed to do. We informed ATC we needed to jettision fuel to land. We were given clearance from ATC to dump fuel. We informed ATC we would be dumping for 20-30 min. We were given holding instructions to dump. At completion of dumping we contacted ATC; and received a clearance to the departure airport. We finished all required check lists and landed uneventfully.

Original NASA ASRS Text

Title: B747 Relief pilot reported being summoned from the bunk room after the flying First Officers ADC fails; about two hours after departure. Fuel is dumped and the flight returned to the departure airport.

Narrative: I was one of the relief pilots on this flight. Approx. 2 hr's after push back; myself and the other relief pilot was awoken from our required rest. After entering the cockpit we were informed that the First Officer's Air Data Computer (ADC) failed and we were returning. We were informed of what the flying pilots had done and we discussed what else we needed to do. We informed ATC we needed to jettision fuel to land. We were given clearance from ATC to dump fuel. We informed ATC we would be dumping for 20-30 min. We were given holding instructions to dump. At completion of dumping we contacted ATC; and received a clearance to the departure airport. We finished all required check lists and landed uneventfully.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

B747 relief pilot reported being summoned from the bunk room after the flying first officers air data computer fails; about two hours after departure. Fuel is dumped and the flight returned to the departure airport.