On an oceanic flight established procedures are employed to handle a nacelle temperature overheat on...

Attributes
ACN	588503
Time
Date	200307
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zoa.artcc
State Reference	CA
Altitude	msl single value : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : rjtg.artcc artcc : zoa.artcc
Operator	common carrier : air carrier
Make Model Name	B747-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level cruise : enroute altitude change
Route In Use	enroute airway : r220.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument pilot : private pilot : multi engine
Experience	flight time last 90 days : 104.1 flight time total : 10500 flight time type : 3000
ASRS Report	588503
Person 2
Affiliation	company : air carrier
Function	other personnel
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : temp indicator other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft Airspace Structure ATC Human Performance
Primary Problem	Aircraft

Narrative:

Flight was dispatched from panc to rjbb with re-dispatch to rksi anticipated before stage. The flight was navigating on 220 degree radial. During cruise the #4 nacelle temperature indicator increased to 5.9. Procedures were accomplished in accordance with the flight handbook and the company was notified through san francisco radio HF phone-patch. At XA02 UTC indications fluctuated to 6.5 and rose to 7.0. Flight continued to accomplish abnormal procedures per the flight handbook. The requirement to reduce the #4 thrust lever led to a degradation of performance and the aircraft could no longer maintain FL370. A request to ATC for a lower flight level was denied. Flight declared an emergency and began a drift-down to a suitable flight level and an offset to the south off course in accordance with published contingency procedures. The flight stabilized at FL335 and naved parallel to 220 degree radial with a 25 NM offset. ATC was notified. The company was contacted via HF phone-patch, advised of situation, and was requested to perform a reanalysis. Pertinent information such as location, flight level, temperature, winds, and fuel remaining were provided to the company. Flight was re-dispatched to rjty by company. A new ATC clearance was received and the flight proceeded to rjty via 220 degree radial at FL330. The emergency declaration remained in effect until arrival at rjty.

Original NASA ASRS Text

Title: ON AN OCEANIC FLT ESTABLISHED PROCS ARE EMPLOYED TO HANDLE A NACELLE TEMP OVERHEAT ON A B747-200. WHEN REFUSED DSCNT BY ATC AN EMER IS DECLARED FOR DRIFT-DOWN AND TRACK OFFSET PER ESTABLISHED PROCS.

Narrative: FLT WAS DISPATCHED FROM PANC TO RJBB WITH RE-DISPATCH TO RKSI ANTICIPATED BEFORE STAGE. THE FLT WAS NAVING ON 220 DEG RADIAL. DURING CRUISE THE #4 NACELLE TEMP INDICATOR INCREASED TO 5.9. PROCS WERE ACCOMPLISHED IN ACCORDANCE WITH THE FLT HANDBOOK AND THE COMPANY WAS NOTIFIED THROUGH SAN FRANCISCO RADIO HF PHONE-PATCH. AT XA02 UTC INDICATIONS FLUCTUATED TO 6.5 AND ROSE TO 7.0. FLT CONTINUED TO ACCOMPLISH ABNORMAL PROCS PER THE FLT HANDBOOK. THE REQUIREMENT TO REDUCE THE #4 THRUST LEVER LED TO A DEGRADATION OF PERFORMANCE AND THE ACFT COULD NO LONGER MAINTAIN FL370. A REQUEST TO ATC FOR A LOWER FLT LEVEL WAS DENIED. FLT DECLARED AN EMER AND BEGAN A DRIFT-DOWN TO A SUITABLE FLT LEVEL AND AN OFFSET TO THE S OFF COURSE IN ACCORDANCE WITH PUBLISHED CONTINGENCY PROCS. THE FLT STABILIZED AT FL335 AND NAVED PARALLEL TO 220 DEG RADIAL WITH A 25 NM OFFSET. ATC WAS NOTIFIED. THE COMPANY WAS CONTACTED VIA HF PHONE-PATCH, ADVISED OF SIT, AND WAS REQUESTED TO PERFORM A REANALYSIS. PERTINENT INFO SUCH AS LOCATION, FLT LEVEL, TEMP, WINDS, AND FUEL REMAINING WERE PROVIDED TO THE COMPANY. FLT WAS RE-DISPATCHED TO RJTY BY COMPANY. A NEW ATC CLRNC WAS RECEIVED AND THE FLT PROCEEDED TO RJTY VIA 220 DEG RADIAL AT FL330. THE EMER DECLARATION REMAINED IN EFFECT UNTIL ARR AT RJTY.

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.

On an oceanic flight established procedures are employed to handle a nacelle temperature overheat on a B747-200. When refused descent by ATC an emergency is declared for drift-down and track offset per established procedures.