737
Number: SHZ-21 R1 Date: June 30, 2004 Document Effectivity:
Subject: PSEU Fault Indications
Reason: To inform flight crews of a configuration warning anomaly. The
purpose of this reissue is to provide Service Bulletin information.
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
There have been several cases of nuisance landing configuration warnings on BBJ airplanes when flaps are retracted after takeoff. This configuration warning is the result of a malfunctioning flap position switch (S138) in the Flap Control Unit.
An internal short in the S138 switch can initiate a landing configuration warning horn which will sound intermittently or continuously and cannot be silenced by the Landing Gear Warning Cutout Switch. Condition of the S138 switch is monitored by the Proximity Switch Electronics Unit (PSEU). Current PSEU logic incorrectly identifies this fault as a dispatchable condition. Detection of an internal short in the S138 switch on the ground results in a PSEU light which will illuminate on RECALL and extinguish during Master Caution system reset. Once airborne, the internal short causes an intermittent or continuous horn that can only be silenced by extending the flaps, lowering the landing gear, or pulling the Aural Warning circuit breaker.
Flight Crew Operations Manual Bulletin No. SHZ-21 R1, dated June 30, 2004 (continued)
Operating Instructions
Pulling the Aural Warning circuit breaker is not recommended as it disables other aural warning functions including the Autopilot Disconnect warning tone and the Cabin Altitude warning horn. Flight crews experiencing an inappropriate landing configuration warning should consider a return to landing as soon as flight conditions permit.
In addition, the PSEU Non Normal Checklist has been revised to remove the Master Caution system reset step. All PSEU light illuminations will require maintenance action prior to takeoff until further notice.
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 SHZ-21 R1 "IN EFFECT" (IE).
This bulletin replaces bulletin SHZ-21, dated March 17, 2001. Discard bulletin SHZ-21. Revise the Bulletin Record to show SHZ-21 as "CANCELLED" (CANC).
This anomaly is corrected by Boeing Service Bulletin 737-32A1343. This FCOM Bulletin will be canceled after Boeing is notified that all affected airplanes in the operator’s fleet have been modified.
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
Flight Crew Operations Manual Bulletin
for
The Boeing Company Seattle, Washington 98124-2207
737
Number: SHZ-23 R1 Date: June 30, 2004 Document Effectivity:
Subject: Inflight Start EGT Display
Reason: To inform flight crews that the inflight start EGT start limit and exceedance indications may not appear correctly below 20,000 feet. The purpose of this reissue is to provide Service Bulletin information.
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
Exhaust Gas Temperature (EGT) is normally displayed on the center instrument panel upper display unit (DU) as both a digital readout and a round dial/moving pointer indication. Maximum operating limits are indicated by redlines.
The EGT Start Limit redline is displayed during engine start when N2 is less than idle. If an exceedance is noted by the electronic engine control (EEC), the digital readout, box, pointer and indicator change color to red.
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