# AD 73-09-02: Fuselage Frames - Type: Airworthiness directive - Status: Current - Products: Boeing DC-9-11, DC-9-12, DC-9-13, DC-9-14, DC-9-15 and DC-9-15F - Effective: January 31, 1979 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-3401 - Registered aircraft: 5 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6F285AECA86770C786256E0C00710A0E.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/73-09-02 ## The airworthiness directive 73-09-02 MCDONNELL DOUGLAS: Amendment 39-1628 as amended by Amendments 39-1926, 39-2004 and 39-2850 is further amended by Amendment 39-3401. Applies to Model DC-9-10 Series Airplanes certificated in all categories. Compliance required as indicated: To detect fatigue cracks in the fuselage frames (P/N 9915590, 9958198, 9958200 and 9958202) at fuselage stations 503, 525, or 544 accomplish the following: A. 1. For airplanes with 10,000 hours or more time in service on the effective date of this A.D., unless already accomplished within the last 500 hours time in service prior to the effective date of this A.D., within the next 1000 hours time in service and thereafter at intervals not to exceed 2000 hours time in service from the last inspection, inspect the left and right hand lower sections of the fuselage frames P/N 9915590, 9958198, 9958200, and 9958202, in accordance with the instructions and procedures of paragraph B, below. 2. For airplanes with less than 10,000 hours time in service on the effective date of this A.D., comply with paragraph (B) before the accumulation of 11,000 hours time in service. B. 1. Visually inspect for evidence of cracking, using dye penetrant methods and/or a magnifying glass with a minimum of 4-power, or an equivalent method approved by the Chief, Aircraft Engineering Division, FAA Western Region, the areas between and surrounding the two upper bolts (including the inboard flange of the lower section of the frame) which attach the rear face of the lower section of the fuselage frames (9915590, 9958198, 9958200 and 9958202) to the transverse floor beam member at fuselage stations 503, 525, and 544, both left and right hand sides. 2. If cracks are found: a. Replace with a new part(s) of the same design; or, b. Repair per an equivalent method approved by the Chief, Aircraft Engineering Division, FAA Western Region; or c. Repair per the instructions specified in Douglas Service Bulletin 53-117, dated December 21, 1973, or later FAA-approved revisions. 3. If a new part(s) of the same design are installed per B.2.a., or repairs accomplished per B.2.b., above, the repetitive inspections per this A.D. may be discontinued for that part(s) only, until the new part has accumulated an additional 10,000 hours time in service, at which time reinstate the program of repetitive inspections and/or corrective action per this A.D. 4. If a repair incorporating Service Bulletin 53-117, dated December 21, 1973, or later FAA-approved revisions, per B.2.c., above, or an equivalent repair approved by the Chief, Aircraft Engineering Division, FAA Western Region, is accomplished, the inspections required by this A.D. may be terminated, and normal, routine maintenance practices reinstated. Amendment 39-1628 became effective May 30, 1973. Amendment 39-1926 became effective August 26, 1974. Amendment 39-2004 became effective November 13, 1974. Amendment 39-2850 became effective March 20, 1977. This amendment 39-3401 becomes effective January 31, 1979. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A6WE](https://openairdocs.org/tcds/A6WE): The Boeing Company; names 6 of 25 models: DC-9-12, DC-9-15F, DC-9-13, DC-9-11, DC-9-15, DC-9-14 ## 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: 5 (5 by airframe model, 0 by engine model) - Makers: Mcdonnell Douglas 3, Douglas 2 Models with the most aircraft: - [Mcdonnell Douglas DC-9-15F](https://openairdocs.org/model/mcdonnell-douglas-dc-9-15f): 3 aircraft (airframe model) - [Douglas DC9-15](https://openairdocs.org/model/douglas-dc9-15): 1 aircraft (airframe model) - [Douglas DC-9-15F](https://openairdocs.org/model/douglas-dc-9-15f): 1 aircraft (airframe model) All 3 models: https://openairdocs.org/ad/73-09-02/models.md Every aircraft: https://openairdocs.org/ad/73-09-02/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.