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Operations Manual. Amend the Bulletin Record to show bulletin ILF2-34(R2) IN
EFFECT (IE).
This condition is temporary until the system is modified. This bulletin will be
revised to include Service Bulletin information when available.
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
CS3 - 2658 Page 1 of 4
Sect Name Section Name
Operations Manual Bulletin
for
The Boeing Company
Seattle, Washington 98124-2207
International Lease Finance Corp.
Number: ILF2-36(R2)
Date: April 1, 1999
Document Effectivity: D6-30151-425
Subject: ERRONEOUS ILS RECEIVER OUTPUTS
Reason: To advise operators of possible erroneous outputs from the Allied Signal
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.
“Quantum” ILS receiver. Revised for administrative purposes.
Background Information
A potential failure within the Allied Signal “Quantum” ILS receiver may cause
either an erroneous localizer deviation indication, or an erroneous glideslope
deviation indication on a PFD, or ND (when displaying approach data). The
localizer or glideslope deviation indication on the opposite PFD or ND is not
affected if this failure occurs in a single ILS receiver.
The autopilot flight director system (AFDS) compares signals from the three ILS
receivers and will not use signals from a failed receiver. The EICAS alert message
NO LAND 3 is displayed when the AFDS senses a failed receiver. The AFDS will
continue the approach with no degradation in performance and the AFDS status
LAND 2 will be displayed on the PFD.
If the airplane was dispatched with two operable ILS receivers and a subsequent
ILS receiver failure occurs while on approach, the autopilot will disengage and the
flight director command bars will no longer be displayed. There is no available
source of ILS data to verify correct approach information. No ILS or localizer
approach can be flown.
Operating Instructions
This bulletin applies to all airplanes equipped with Allied Signal “Quantum” ILS
Receivers (P/N 066-50006-0101).
Page 2 of 4
Operations Manual Bulletin No. ILF2-36(R2), Dated April 1, 1999 (continued)
Do not attempt a manual (no autopilot, no flight director) raw data ILS or localizer
approach/departure.
Do not attempt an ILS or Localizer autopilot departure or approach/landing, or
manual approach/departure using the flight director with the EICAS advisory
message SNGL SOURCE ILS displayed.
While cross checking the Captain’s and First Officer’s flight displays, if a
disagreement is noted between the two ILS raw data displays on an approach,
attempt to isolate the failed signal as described below.
This should only be attempted as time permits, and should be completed above
1500 feet AGL.
- The Pilot Not Flying (PNF) should move the EIU SOURCE SELECTOR
from the AUTO position to the C position. (Make sure Captain’s and First
Officer’s EIU SOURCE SELECTORS are not selecting the same EIU.)
- If the Captain’s and First Officer’s displays agree, continue the approach and
landing.
- If the displays disagree, the PNF shouldmove the EIU SOURCE SELECTOR
from the C position back to theAUTO position, and the Pilot Flying (PF) should
move the EIU SOURCE SELECTOR from the AUTO position to the C position.
- If the Captain’s and First Officer’s displays agree, continue the approach and
landing. Otherwise, initiate a go-around unless visual contact with the runway has
been established.
If a go-around has been initiated, it is possible to inhibit display of erroneous ILS
deviation indications by placing the ILS in PARK (DEL the ILS frequency on the
NAV RAD page) for one minute, then re-selecting the desired ILS frequency and
course.
Page 3 of 4
Operations Manual Bulletin No. ILF2-36(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 ILF2-36(R2) IN
EFFECT (IE).
This condition is under investigation. This bulletin will remain in effect until
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