2.
Following change in ALT selection in the MCP window, check the ALT display to ensure desired altitude is displayed:
3.
Closely monitor altitude during all altitude changes to ensure that the autopilot captures and levels off at the desired altitude.
NOTE: Standard “callouts,” crew coordination, and cross-checking of MCP settings and flight instruments are necessary to detect any nonselected MCP display changes.
Recommended Operating Procedures
Until Service Bulletin 737-22A1098 is incorporated, flight crews should be made aware of the following recommended operating procedures:
UNCOMMANDED MCP SETTING CHANGES The MCP selected and displayed settings may change without command and with no alert warning.
Anytime electrical power is interrupted: MCP Settings.........................................CHECK AND RESET AS NECESSARY Anytime the MCP selected altitude is changed: MCP Altitude.................. ......................CHECK AND RESET AS NECESSARY Closely monitor the altimeter during all altitude changes to ensure the autopilot
acquires and levels off at the correct altitude. Use standard callouts and crew coordination, and cross-check MCP settings with flight instruments to detect any uncommanded MCP changes.
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-14 "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 Service Bulletin 737-22A1098. 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.
Page 2 of 4
Flight Crew Operations Manual Bulletin No. ELF-14,dated June 16, 1995 (continued)
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
Page 3 of 4
Flight Crew Operations Manual Bulletin No. ELF-14,dated June 16, 1995 (continued)
Intentionally
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Page 4 of 4
Flight Crew Operations Manual Bulletin
for
The Boeing Company Seattle, Washington 98124-2207
737
Number: ELF-15 Date: June 16, 1995 Document Effectivity:
Subject: Auxiliary Power Unit (APU) Starting
Reason: This bulletin provides information contained in Red Bulletin 737-500 90-4R2, dated September 30, 1991, which advised flight crews of the requirement for a qualified ground observer to monitor subsequent starts following unsuccessful Auxiliary Power Unit (APU) ground
start.
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
On January 22, 1990 an operator of a Boeing Model 737 series airplane experienced significant fire damage to the empennage. The damaged area was reported to be the elevator, trim tab and tail cone. This damage was due to Auxiliary Power Unit (APU) torching following an unsuccessful first start attempt. A previous incident occurred on March 17, 1989. Empennage damage similar to that of the most recent incident was reported.
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