# AD 64-15-01: Fillet Flap Drive Screw Support Assemblies - Type: Airworthiness directive - Status: Current - Products: Boeing 707-300B Series and 707-300C Series - Effective: July 8, 1964 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4447E0DAAA6DF1208625699200510EEB.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/64-15-01 ## The airworthiness directive 64-15-01 BOEING: Amdt. 756 Part 507 Federal Register July 3, 1964. Applies to All Models 707-300B and 707-300C Series Aircraft Listed in Boeing Service Bulletin No. 1962(R- 1). Compliance required as indicated. Cracks have occurred in the flange of the left and right fillet flap drive support assembly, P/N's 65-22244-1 and -2. In each instance the crack originated in the lower inboard flange area of the subject assemblies. To correct this condition, accomplish the following: (a) Within 30 hours' time in service after the effective date of this AD, unless already accomplished within the last 100 hours' time in service, and thereafter at periods not to exceed 130 hours' time in service from the last inspection, visually inspect the upper and lower inboard and outboard flanges of the fillet flap drive screw support assemblies, P/N's 65-22244-1 and -2 for cracks. Parts found to be cracked shall be repaired before further flight in accordance with either paragraph (b), (c), or(d). (b) Repair cracks before further flight in accordance with Boeing Service Bulletin No. 1962(R-1), Paragraph 3, Part II, "Repair Data", or later FAA approved revisions; or in a manner approved by the Chief, Aircraft Engineering Division, FAA Western Region. (c) Stop drill the crack(s) in the flange with 0.25 inch hole(s) and shim in accordance with step "D", Part II, of Service Bulletins Nos. 1962(R-1) and 1962(R-1)A, and do not remove the flange. (NOTE: In this case the flange would serve as the filler.) (d) If the maximum total length of the crack or the series of cracks does not exceed 6 inches in the upper and lower outboard flanges and 2 inches in the upper and lower inboard flanges: (1) Stop drill any crack or cracks with a 0.25 inch hole. (2) Visually inspect cracks daily which have been stop drilled, for growth or propagation beyond the stop drill hole. If any growth is noted, additional stop drilling is required with the total crack length including propagation not to exceed the limits specified above. If a crack or cracks are found which exceed these limits, they must be repaired before further flight in accordance with paragraph (b) or (c). (3) Accomplish a permanent repair in accordance with paragraph (b) or (c) within 125 hours' time in service after crack detection. (e) When a permanent repair of cracked flanges is accomplished in accordance with paragraph (b) or (c) or if the preventive modification of uncracked flanges in Part III of Service Bulletins NOs. 1962(R-1), 1962(R-1)A, or later FAA approved revisions is accomplished, the repetitive inspections specified in paragraph (a) may be discontinued. (f) Upon request of an operator, an FAA maintenance inspector, subject to prior approval of the Chief, Aircraft Engineering Division, FAA Western Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for such operator. (Boeing Service Bulletins Nos. 1962(R-1) and 1962(R-1)A cover this same subject.) This directive effective July 8, 1964. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 4A26](https://openairdocs.org/tcds/4A26): The Boeing Company; names 2 of 4 models: 707-300B Series, 707-300C Series ## 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: 6 (6 by airframe model, 0 by engine model) - Makers: Boeing 6 Models with the most aircraft: - [Boeing 707-338C](https://openairdocs.org/model/boeing-707-338c): 2 aircraft (airframe model) - [Boeing 707-368C](https://openairdocs.org/model/boeing-707-368c): 1 aircraft (airframe model) - [Boeing 707-321B](https://openairdocs.org/model/boeing-707-321b): 1 aircraft (airframe model) - [Boeing 707-323B](https://openairdocs.org/model/boeing-707-323b): 1 aircraft (airframe model) - [Boeing 707-351B](https://openairdocs.org/model/boeing-707-351b): 1 aircraft (airframe model) All 5 models: https://openairdocs.org/ad/64-15-01/models.md Every aircraft: https://openairdocs.org/ad/64-15-01/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.