If the oil quantity indicates 21 liters or more, maintenance investigation is required prior to takeoff.
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Operations Manual Bulletin No. ILF2-13(R2), Dated April 1, 1999 (continued)
Administrative Information
Insert this bulletin behind the Bulletin Record page in Volume 1 of your Operations Manual. Amend the Bulletin Record to show bulletin ILF2-13(R2) IN EFFECT (IE).
This Operations Manual Bulletin will be cancelled after Boeing is notified all affected airplanes in your fleet have been modified by GE Service Bulletin 72-648. If you do not plan to modify all your airplanes and would like to have the contents of this Bulletin incorporated in your Operations Manual, please advise Boeing accordingly. Please send all correspondence regarding Operations Manual Bulletin status to one of the following addresses:
Mailing Address: Manager, Flight Technical Publications (747-400)
Boeing Commercial Airplane Group P.O. Box 3707 MS 20-89
Seattle, WA 98124-2207 USA
Fax: Telex: (206) 662-7812 32-9430 Station 627
SITA: SEABO7X
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Operations Manual Bulletin No. ILF2-13(R2), Dated April 1, 1999 (continued)
Intentionally
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Operations Manual Bulletin
for
International Lease Finance Corp.
The Boeing Company Seattle, Washington 98124-2207
Number: ILF2-28(R2)
Date: April 1, 1999 Document Effectivity: D6-30151-425 Subject: ENGINE OPERATION IN HEAVY RAIN OR HAIL Reason: To inform flight crews of revised procedures for use of autothrottle in
heavy rain or hail. Revised for administrative purposes.
Information in this bulletin is recommended by The Boeing Company, but may not be FAA approved at the time of writing. In the event of conflict with the FAA approved Airplane Flight Manual (AFM), the AFM shall supersede. The Boeing Company regards the information or procedures described herein as having a direct or indirect bearing on the safe operation of this model airplane.
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
Boeing has received reports of GE engine flameout and subsequent engine recovery while operating in heavy rain. In one dual engine flameout incident, digital flight data recorder (DFDR) information revealed the autothrottle was engaged and commanding a thrust increase from approach idle when the flameouts occurred. While the reported flameouts occurred in heavy rain, water ingestion by itself has been ruled out as the sole cause of these events. Engineering analysis of DFDR data has determined the most likely cause to be rapid variable bleed valve (VBV) closure resulting from autothrottle thrust increases during sustained engine ingestion of supercooled water and ice.
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