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failures in the event a fire occurs in the oil vent system.
Page 2 of 4
Operations Manual Bulletin No. ILF2-13(R2), Dated April 1, 1999 (continued)
Boeing previously advised internal leakage of fuel into the oil system should be
suspected if the oil quantity indication was at or approaching 20 or more quarts
after engine start. However, since issue of the original bulletin, several operators
have reported oil quantity indications of approximately 21 quarts after engine start
which, when investigated, were not due to fuel/oil contamination. The increase in
oil quantity was due to a slight over-servicing, oil expansion due to temperature
increase, or an increase in scavenge efficiency with the engine at idle. For these
reasons, the oil quantity check after engine start has been increased to 22 quarts
(21 liters).
Information from these events has shown inconsistent indications for fuel in the
oil system which cannot provide a sound basis for in-flight crew procedures. Since
flight crews do not continuously monitor oil system indications, changes in oil
system parameters may not be noticed. However, if the oil quantity is observed to
be increasing during steady state operation or if at any time during engine
operation the oil quantity indication is at or approaching 21 liters or more, internal
leakage of fuel into the oil system should be suspected. This condition should be
entered in the Flight Log for maintenance action prior to the next flight.
The first cockpit indication of a fuel-contaminated oil system may be an
increasing or overfilled oil tank quantity. The rate of oil quantity increase depends
on the severity of the fuel leak. Leaks are normally detected by maintenance
personnel during required checks, or while investigating flight crew complaints of
increasing oil quantity. An extreme overfilled condition may be accompanied by
increasing oil temperature, fluctuating or decreasing oil pressure, or fuel/oil fumes
in the cabin. The Smoke Air Conditioning procedures was issued to handle smoke
or fumes in the cabin.
Additional maintenance checks have been implemented following servicing of oil
tanks or after maintenance on the engine oil or fuel system to detect fuel
contamination of the oil. This results in more frequent checks of the oil system.
Operating Procedure
Since data on at least one uncontained failure indicates the oil tank was overfilled
at engine start, accomplish the following check until GE SB 72-648 is
incorporated.
At least 30 seconds after the engine reaches stabilized idle and prior to taxi:
OIL QUANTITY ..............CHECK
If the oil quantity indicates 21 liters or more, maintenance investigation is required
prior to takeoff.
Page 3 of 4
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: (206) 662-7812
Telex: 32-9430 Station 627
SITA: SEABO7X
Page 4 of 4
Operations Manual Bulletin No. ILF2-13(R2), Dated April 1, 1999 (continued)
Intentionally
Blank
CS3 2504 Page 1 of 2
Sect Name Section Name
Operations Manual Bulletin
for
The Boeing Company
Seattle, Washington 98124-2207
International Lease Finance Corp.
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
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
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.
heavy rain or hail. Revised for administrative purposes.
　
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