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listed in Table 1 of this AD.
Table 1 – Applicability by Service Bulletin
Bombardier
Service Bulletin
Revision
Level
Date Learjet Model(s)
SB 23-28-6 Original April 21, 1998 23
SB 24/25-28-3 2 February 21, 1998 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A,
24E, 24F, and 24F-A airplanes; and 25, 25A,
25B, 25C, 25D, and 25F airplanes
SB 28/29-28-4 3 June 2, 1999 28 and 29 airplanes
SB 31-28-7 3 January 26, 2001 31 and 31A airplanes
SB 35/36-28-11 4 December 4, 2000 35 and 35A (C-21A) airplanes; 36 and 36A
airplanes
SB 55-28-13 3 December 15, 2000 55, 55B and 55C airplanes
Unsafe Condition
(d) This AD results from a report of inadvertent operation of a standby fuel pump due to an
electrical system malfunction. We are issuing this AD to prevent this inadvertent operation, which
could result in inadvertent fuel transfer by the left or right wing fuel system and subsequent overlimit
fuel imbalance between the left and right wing fuel loads. This imbalance could affect lateral
control of the airplane which could result in reduced controllability.
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Compliance
(e) You are responsible for having the actions required by this AD performed within the
compliance times specified, unless the actions have already been done.Modification
(f) Within 24 months after the effective date of this AD: Modify the left- and right-hand standby
fuel pump switches, in accordance with the Accomplishment Instructions of the applicable service
bulletin identified in Table 1 of this AD.
Airplane Flight Manual (AFM) Revision
(g) Before further flight after accomplishing the modification required by paragraph (f) of this
AD: Revise the Emergency and Abnormal Procedures sections of the applicable Learjet AFM to
advise the flightcrew of proper procedures to follow in the event of failure of the standby fuel pump
to shut off by including the information in the applicable Learjet temporary flight manual (TFM)
changes identified in Table 2 of this AD. This may be done by inserting a copy of the TFM changes
into the AFM. When the TFM changes have been included in the general revisions of the AFM, those
general revisions may be inserted into the AFM, provided the relevant information in the general
revisions is identical to that in the TFM changes.
Table 2 – TFM Changes
Learjet
Model(s)
Learjet TFM
Change
Date To the Learjet AFM
24, 25, 28,
29, 31, 35,
36, and 55
airplanes
TFM 96-08 May 30,
1996
24 (FM-004), 24B (FM-006), 24D (FM-009), 24E
(FM-011), 24F (FM-012), 24 ECR 736 (FM-008), 25
(FM-014), 25B/C (FM-016), 25D/F (FM-018), 28/29
(FM-100), 31 (FM-112), 31A (FM-121), 35/36 (FM-
019), 35A/36A FC-200 (FM-102), 35A/36A FC-530
(FM-108), 55 (FM-103), 55B (FM-110), 55C (FM-114)
24, 25, 28,
29, 31, 35,
36, and 55
airplanes
TFM 96-09 May 30,
1996
24 (FM-004), 24B (FM-006), 24D (FM-009), 24E
(FM-011), 24F (FM-012), 24 ECR 736 (FM-008), 25
(FM-014), 25B/C (FM-016), 25D/F (FM-018), 28/29
(FM-100), 31 (FM-112), 31A (FM-121), 35/36 (FM-
019), 35A/36A FC-200 (FM-102), 35A/36A FC-530
(FM-108), 55 (FM-103), 55B (FM-110), 55C (FM-114)
23
airplanes
TFM 98-01 May 11,
1999
23 (FM-003)
23
airplanes
TFM 98-02 May 11,
1999
23 (FM-003)
Alternative Methods of Compliance (AMOCs)
(h)(1) The Manager, Wichita Aircraft Certification Office (ACO), FAA, has the authority to
approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19.
(2) Before using any AMOC approved in accordance with § 39.19 on any airplane to which the
AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate
Holding District Office.
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Material Incorporated by Reference
(i) You must use the applicable service information identified in Tables 3 and 4 of this AD to
perform the actions that are required by this AD, unless the AD specifies otherwise. (Only page 1 of
Learjet Temporary Flight Manual Change TFM 96-08, dated May 30, 1996; and Learjet Temporary
Flight Manual Change TFM 96-09, dated May 30, 1996; contain the document date, no other pages
of the document contain this information.) The Director of the Federal Register approved the
incorporation by reference of these documents in accordance with 5 U.S.C. 552(a) and 1 CFR part
51. Contact Learjet, Inc., One Learjet Way, Wichita, Kansas 67209-2942, for a copy of this service
information. You may review copies at the Docket Management Facility, U.S. Department of
Transportation, 400 Seventh Street SW., Room PL-401, Nassif Building, Washington, DC; on the
　
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