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Flight Crew Operations Manual Bulletin
for
The Boeing Company Seattle, Washington 98124-2207
737
Number: ELF-10 Date: June 16, 1995 Document Effectivity:
Subject: Intermittent/Inoperative EGT Indications
Reason: This bulletin provides information contained in Red Bulletin 73786-7R2, dated March 28, 1993, which advised flight crews intermittent or inoperative EGT indications have been reported. -300 that
Information in this Flight Crew Operations Manual (FCOM) 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 received several reports of intermittent, inoperative and random excursions of EGT indications. These anomalies were accompanied by normal fuel flow, N1 and N2 RPM indications. In some cases the anomalies resulted in unnecessary engine shutdowns. A sudden change in EGT indication that occurs without a change in fuel flow, N1 or N2 RPM may be an indicating system anomaly rather than an engine malfunction.
The cause of these anomalies is associated with a particular EGT thermocouple harness connector. A redesign of the electrical connector was coordinated with CFMI.
Maintenance Inspection procedure, 737 SL-777-7, was issued to be performed when abnormal EGT indications are reported. Service Bulletin 737-77-1019 was issued to correct this condition.
Actual increases in EGT beyond limits will be accompanied by obvious increase in fuel flow. If fluctuating or off scale high EGT is noted, and comparison of the two engines indicates equal fuel flow at equivalent RPM, the EGT indication may be considered to be incorrect, and the engine need not be shut down.
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Flight Crew Operations Manual Bulletin No. ELF-10,dated June 16, 1995 (continued)
However, if a high EGT indication occurs with an increase in fuel flow or with other abnormal engine parameters, the flight crew should complete the non-normal procedure for ENGINE OVERTEMPERATURE DURING TAKEOFF OR INFLIGHT. If high EGT indications occur on takeoff after V1, do not accomplish this procedure until the airplane reaches a safe altitude.
NOTE: Due to the dynamic conditions of rapidly rising EGT and increasing fuel flow, N1 and N2 RPM during engine start, high or over limit EGT should always be treated as an accurate indication and the aborted start procedure accomplished.
All abnormal EGT indications should be reported for maintenance action.
An operable EGT system is required for each engine for dispatch.
Administrative Information
Insert this bulletin behind the FCOM Bulletin Record Page in Volume 1 of your FCOM. Amend the FCOM Bulletin Record Page to show Bulletin ELF-10 "IN EFFECT" (IE).
This Operations Manual Bulletin will be cancelled after Boeing is notified that all affected airplanes in the operator’s fleet have been modified by Boeing Service Bulletin 737-77-1019. If the operator does not plan to modify all the airplanes and would like to have the contents of this Bulletin incorporated in the Operations Manual, please advise Boeing accordingly.
Please send all correspondence regarding FCOM bulletin status to one of the
following addresses:
Mailing Address: Manager 737, Flight Technical Integration & Data Boeing Commercial Airplane Group P. O. Box 3707 MS 20-89 Seattle, WA 98124-2207 USA
Fax Number: Telex: SITA: E-MAIL: (206) 662-7812 329430 Station 627 LKEBO7X FTID@Boeing.com
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Flight Crew Operations Manual Bulletin
for
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