AD 2007-04-18 Airworthiness Directives; Learjet Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F, 28, 29, 31, 31A, 35, 35A (C-21A), 36, 36A, 55, 55B, and 55C Airplanes

This AD applies to the Learjet models identified in the applicable Bombardier service bulletin 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.

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. 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 Internet at http://dms.dot.gov; or at the National Archives and Records Administration (NARA). For information on the availability of this material at the NARA, call (202) 741-6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. Table 3.—Service Bulletins Incorporated by Reference Bombardier service bulletin Revision level Date SB 23-28-6 Original Issue April 21, 1998. SB 24/25-28-3 2 February 21, 1998. SB 28/29-28-4 3 June 2, 1999. SB 31-28-7 3 January 26, 2001. SB 35/36-28-11 4 December 4, 2000. SB 55-28-13 3 December 15, 2000. Table 4.—Temporary Changes Incorporated by Reference Learjet Temporary Flight Manual (TFM) change Date To the Learjet Airplane Flight Manual 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) 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) TFM 98-01 May 11, 1999 23 (FM-003) TFM 98-02 May 11, 1999 23 (FM-003) Issued in Renton, Washington, on February 6, 2007. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E7-2640 Filed 2-15-07; 8:45 am] BILLING CODE 4910-13-P

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 over-limit 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.