A B747-200 in cruise at FL310 diverted due to #1 engine failure caused by loss of N2 spool rotation.

Attributes
ACN	483265
Time
Date	200008
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : rjtg.airport
State Reference	FO
Altitude	msl single value : 31000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : rjtg.artcc
Operator	common carrier : air carrier
Make Model Name	B747-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute : pacific
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 15000 flight time type : 1500
ASRS Report	483265
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : #1 engine indicators other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport
Consequence	other other
Supplementary
Problem Areas	Chart Or Publication Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

#1 engine failure in cruise, shut down engine (N2 stopped) deviated to nrt. Callback conversation with reporter revealed the following information: the reporter stated the engine was a JT9D and they first noted the low pressure warning light and oil pressure indicator drop to zero. The reporter said the oil quantity indicator for #1 was indicating almost full. The reporter stated the N2 indicator fell to zero and the engine vibration was felt in the cabin. The reporter said the N1 indication was 35%. The reporter stated #1 engine was immediately shut down. The reporter aid on the ground at narita the technicians could not move the N2 spool.

Original NASA ASRS Text

Title: A B747-200 IN CRUISE AT FL310 DIVERTED DUE TO #1 ENG FAILURE CAUSED BY LOSS OF N2 SPOOL ROTATION.

Narrative: #1 ENG FAILURE IN CRUISE, SHUT DOWN ENG (N2 STOPPED) DEVIATED TO NRT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ENG WAS A JT9D AND THEY FIRST NOTED THE LOW PRESSURE WARNING LIGHT AND OIL PRESSURE INDICATOR DROP TO ZERO. THE RPTR SAID THE OIL QUANTITY INDICATOR FOR #1 WAS INDICATING ALMOST FULL. THE RPTR STATED THE N2 INDICATOR FELL TO ZERO AND THE ENG VIBRATION WAS FELT IN THE CABIN. THE RPTR SAID THE N1 INDICATION WAS 35%. THE RPTR STATED #1 ENG WAS IMMEDIATELY SHUT DOWN. THE RPTR AID ON THE GND AT NARITA THE TECHNICIANS COULD NOT MOVE THE N2 SPOOL.

Data retrieved from NASA's ASRS site as of July 2007 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.