# AD 93-15-12: NLG and MLG Components - Type: Airworthiness directive - Status: Current - Products: Saab AB, Saab Aerosystems SAAB 340B and 340A (SAAB SF340A) - Effective: September 17, 1993 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-8657 - Docket: 93-NM-16-AD - Registered aircraft: 66 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/294ADDFA61C11BA386256A1F00519118.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/93-15-12 ## The airworthiness directive 93-15-12 SAAB-SCANIA: Amendment 39-8657. Docket 93-NM-16-AD. Supersedes AD 92-03-08, Amendment 39-8163, which superseded AD 91-07-02, Amendment 39-6932. Applicability: Model SF340A series airplanes, serial numbers 004 through 159, inclusive; and SAAB 340B series airplanes, serial numbers 160 and subsequent; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To ensure proper operation of the main landing gear (MLG) and the nose landing gear (NLG), accomplish the following: (a) Remove the MLG and NLG components identified in the attachments (listed below) to SAAB Service Bulletin SAAB 340-32-066, Revision 1, dated October 17, 1990, and replace them with serviceable components prior to the accumulation of the number of landings listed in the "Fatigue Life Flights" column of the applicable "Life Limited Parts List," or within 60 days after April 15, 1991 (the effective date of AD 91-07-02, Amendment 39-6932), whicheveroccurs later. Thereafter, replace these components with serviceable components at intervals not to exceed the number of landings listed in the "Fatigue Life Flights" column of the applicable "Life Limited Parts List. " SAAB SERVICE BULLETIN SAAB 340-32-066 ATTACHMENTS AP PRECISION HYDRAULICS SERVICE BULLETIN NUMBER DATE ISSUED ATTACHMENT NUMBER AIR83530-32-07 January 1990 1 AIR83570-32-04 January 1990 2 AIR83572-32-01 January 1990 3 AIR84306-32-07 January 1990 4 AIR84350-32-01 January 1990 5 AIR83022-32-18 REV 1 August 1990 6 (b) Remove the MLG and NLG components identified in the attachments (listed below) to SAAB Service Bulletin SAAB 340-32-066, Revision 1, dated October 17, 1990, and replace them with serviceable components prior to the accumulation of the number of landings listed in the "Fatigue Life Flights" column of the applicable "Life Limited Parts List," or within 60 days after March 16, 1992 (the effective date of AD 92-03-08, Amendment 39-8163), whichever occurs later. Thereafter, replace these components with serviceable components at intervals not to exceed the number of landings listed in the "Fatigue Life Flights" column of the applicable "Life Limited Parts List. " SAAB SERVICE BULLETIN SAAB 340-32-066 ATTACHMENTS AP PRECISION HYDRAULICS SERVICE BULLETIN NUMBER DATE ISSUED ATTACHMENT NUMBER AIR83064-32-02 January 1990 7 AIR84310-32-07 January 1990 8 (c) Remove the MLG and NLG components identified in the attachments (listed below) to SAAB Service Bulletin SAAB 340-32-066, Revision 2, dated June 12, 1992, and replace them with serviceable components prior to the accumulation of the number of landings listed in the "Fatigue Life Flights" column of the applicable "Life Limited Parts List," or within 60 days after the effective date of this AD, whichever occurs later. Thereafter, replace these components with serviceable components at intervals not to exceed the number of landings listed in the "Fatigue Life Flights" column of the applicable "Life Limited Parts List. " SAAB SERVICE BULLETIN SAAB 340-32-066 ATTACHMENTS AP PRECISION HYDRAULICS SERVICE BULLETIN NUMBER DATE ISSUED ATTACHMENT NUMBER AIR83530-32-07 REV 1 January 1992 1 AIR83570-32-04 REV 1 January 1992 2 AIR83572-32-01 REV 1 January 1992 3 AIR84306-32-07 REV 1 January 1992 4 AIR84350-32-01 REV 1 January 1992 5 AIR83022-32-18 REV 2 January 1992 6 AIR83064-32-02 REV 1 January 1992 7 AIR84310-32-07 REV 1 January 1992 8 AIR83608-32-01 January 1992 9 (d) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Standardization Branch, ANM-113. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113. (e) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (f) The modifications shall be done in accordance with SAAB Service Bulletin SAAB 340-32-066, Revision 2, dated June 12, 1992, and SAAB Service Bulletin SAAB 340-32-066, Revision 1, dated October 17, 1990. Revision 2 of SAAB Service Bulletin SAAB 340-32-066 contains the following list of effective pages: Page Number Revision Level Shown on Page Date Shown on Page Title Page, 1 2 June 12, 1992 ATTACHMENT 1 1 1 January 1992 2-3 Original January 1990 ATTACHMENT 2 1-2 1 January 1992 ATTACHMENT 3 1 1 January 1992 2 Original June 1990 ATTACHMENT 4 1-2 1 January 1992 ATTACHMENT 51-2 1 January 1992 ATTACHMENT 6 1, 3 2 January 1992 2, 4 Original January 1990 ATTACHMENT 7 1, 3 1 January 1992 2 Original January 1990 ATTACHMENT 8 1 1 January 1992 2-3 Original January 1990 ATTACHMENT 9 1-2 Original January 1992 The incorporation by reference of SAAB Service Bulletin SAAB 340-32-066, Revision 2, dated June 12, 1992, is approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. The incorporation by reference of SAAB Service Bulletin SAAB 340-32-066, Revision 1, dated October 17, 1990, was approved previously by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51 as of March 16, 1992 (57 FR 5376, February 14, 1992). Copies may be obtained from SAAB-SCANIA AB, SAAB Aircraft Product Support, S-581.88, Linkoping, Sweden. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; orat the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (g) This amendment becomes effective on September 17, 1993. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A52EU](https://openairdocs.org/tcds/A52EU): Saab AB; names 2 of 2 models: 340A (SAAB SF340A), SAAB 340B ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 66 (66 by airframe model, 0 by engine model) - Makers: Saab-Scania 42, Saab 15, Saab-Fairchild 8, Saabscania 1 Models with the most aircraft: - [Saab-Scania SAAB 340B](https://openairdocs.org/model/saab-scania-saab-340b): 42 aircraft (airframe model) - [Saab SAAB 340B](https://openairdocs.org/model/saab-saab-340b): 15 aircraft (airframe model) - [Saab-Fairchild 340A](https://openairdocs.org/model/saab-fairchild-340a): 8 aircraft (airframe model) - [Saabscania SAAB 340B](https://openairdocs.org/model/saabscania-saab-340b): 1 aircraft (airframe model) All 6 models: https://openairdocs.org/ad/93-15-12/models.md Every aircraft: https://openairdocs.org/ad/93-15-12/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.