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
Several operators reported that during a No Engine Bleed Takeoff the BLEED TRIP OFF light illuminated. The illumination occurs because a relief valve, specifically built into the pneumatic system to limit duct pressure upstream of the bleed valve during a No Engine Bleed Takeoff, does not have enough flow capacity to limit pressure in the duct below the overpressure switch activation point. Activation of the overpressure switch causes the BLEED TRIP OFF light to illuminate. The bleed system can be reset if duct pressure falls below the overpressure switch point. Duct pressure can be reduced by selecting the engine anti-ice ON.
A minimum altitude of 1500 feet AGL or when obstacle clearance height has been attained is established to maintain consistency with the existing Operations Manual Supplementary Normal No Engine Bleed Takeoff and Landing procedure and to minimize crew work load during the initial takeoff phase of flight.
Page 1 of 4
Flight Crew Operations Manual Bulletin No. ELF-16,dated June 16, 1995 (continued)
The maximum TAT restriction set for anti-ice use to facilitate bleed trip reset was increased from 10°C (50°F) to 38°C (100°F). This increase is acceptable for this interim procedure due to the limited actuation time.
Service Bulletin 3214446-36-1575, released in January 1993, provided instructions for replacement of the current relief valve with a new higher capacity relief valve.
Operating Instructions
Until Service Bulletin 3214446-36-1575 is incorporated, the following operating
instructions are recommended:
If the BLEED TRIP OFF light illuminates during a No Engine Bleed Takeoff and
normal reset is not possible:
Accomplish the following at a minimum of 1500 feet (AGL) or when obstacle clearance height has been attained and TAT is 38°C (100°F) or below.
ENGINE ANTI-ICE SWITCH (Affected Side).................................ON
TRIP RESET SWITCH................................................................RESET
CABIN PRESSURIZATION SYSTEM........................RECONFIGURE
Reset the cabin pressurization system to normal configuration.
ENGINE ANTI-ICE SWITCH(ES)................................AS REQUIRED
If the BLEED TRIP OFF light remains illuminated: Accomplish the BLEED TRIP OFF Checklist.
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-16 "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 3214446-36-1575. 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-16,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
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Flight Crew Operations Manual Bulletin No. ELF-16,dated June 16, 1995 (continued)
Intentionally
Blank
Page 4 of 4
Flight Crew Operations Manual Bulletin
for
The Boeing Company Seattle, Washington 98124-2207
737
Number: ELF-17 R1 Date: September 20, 1995 Document Effectivity:
Subject: Runaway Stabilizer Procedure
Reason: This is a reissue of ELF-17, which notified operators of an intermittent stabilizer trim system anomaly and provided additional guidance when accomplishing the Runaway Stabilizer procedure. The purpose of this reissue is to provide service bulletin information and closing action for the OM bulletin.
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. 中國航空網 m.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：737-300機組操作手冊Flight Crew Operations Manual FCOM 1(19)
