# AD 74-19-06: Torque Tube Cranks - Type: Airworthiness directive - Status: Current - Products: Boeing 747-100 Series, 747-100B Series, 747-100B SUD Series, 747-200B Series, 747-200C Series, 747-200F Series, 747-300 Series, 747-400 Series, 747-400D Series, 747-400F Series, 747SP Series and 747SR Series - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-1960 - Registered aircraft: 63 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F02D5E5D876AA0AC86256832005598DC.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/74-19-06 ## The airworthiness directive 74-19-06 BOEING: Amendment 39-1960. Applies to Boeing Model 747 airplanes, certificated in all categories, which are affected by Boeing Service Bulletin 747-52-2090. Compliance required as indicated: (A) Within the next 1200 hours time in-service after the effective date of this AD, unless already accomplished in the last 800 hours time in-service, and at intervals thereafter not to exceed 2,000 hours time in-service, visually inspect the torque tube cranks, Part Numbers 65B05025-1 and -2, 69B02875-1 and -2, and 65B09704-1 on passenger doors Nos. 2, 4, and 5 right- and left-hand sides for cracks. If cracks are not found, apply LPS-3 and retorque cross bolts in accordance with Paragraph III, Part I of FAA-approved Boeing Service Bulletin 747-52- 2090, dated May 17, 1974, or FAA approved revisions. If cracks are found, repair or replace in accordance with Paragraph (B) below. (B) Cracked parts may be repaired by installation of a saddle clamp in accordance with Paragraph III,Part II of FAA-approved Boeing Service Bulletin 747-52-2090, or FAA-approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, and shall be reinspected in accordance with FAA-approved Boeing Service Bulletin 747-52-2090 at intervals thereafter not to exceed 3,200 hours time in-service. As terminating action, cracked parts may be replaced with new parts in accordance with Paragraph III, Part III of FAA-approved Boeing Service Bulletin 747-52-2090, or FAA-approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. (C) Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection interval of the operator, if the request contains substantiating data to justifythe adjustment. This amendment becomes effective thirty days after September 20, 1974. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A20WE](https://openairdocs.org/tcds/A20WE): The Boeing Company; names 12 of 14 models: 747-100B Series, 747SP Series, 747-400D Series, 747-400F Series, 747-200B Series, 747-200F Series, 747-300 Series, 747-200C 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: 63 (63 by airframe model, 0 by engine model) - Makers: Boeing 63 Models with the most aircraft: - [Boeing 747-446](https://openairdocs.org/model/boeing-747-446): 10 aircraft (airframe model) - [Boeing 747-422](https://openairdocs.org/model/boeing-747-422): 8 aircraft (airframe model) - [Boeing 747-412](https://openairdocs.org/model/boeing-747-412): 5 aircraft (airframe model) - [Boeing 747-400F](https://openairdocs.org/model/boeing-747-400f): 4 aircraft (airframe model) - [Boeing 747-409](https://openairdocs.org/model/boeing-747-409): 4 aircraft (airframe model) - [Boeing 747-481F](https://openairdocs.org/model/boeing-747-481f): 3 aircraft (airframe model) - [Boeing 747-409F](https://openairdocs.org/model/boeing-747-409f): 3 aircraft (airframe model) - [Boeing 747-481](https://openairdocs.org/model/boeing-747-481): 3 aircraft (airframe model) - [Boeing 747-428F](https://openairdocs.org/model/boeing-747-428f): 3 aircraft (airframe model) - [Boeing 747-123](https://openairdocs.org/model/boeing-747-123): 2 aircraft (airframe model) - [Boeing 747-251F](https://openairdocs.org/model/boeing-747-251f): 2 aircraft (airframe model) - [Boeing 747-443](https://openairdocs.org/model/boeing-747-443): 2 aircraft (airframe model) - [Boeing 747-438](https://openairdocs.org/model/boeing-747-438): 2 aircraft (airframe model) - [Boeing 747-428](https://openairdocs.org/model/boeing-747-428): 2 aircraft (airframe model) - [Boeing 747-257B](https://openairdocs.org/model/boeing-747-257b): 1 aircraft (airframe model) - [Boeing 747-283B](https://openairdocs.org/model/boeing-747-283b): 1 aircraft (airframe model) - [Boeing 747-121](https://openairdocs.org/model/boeing-747-121): 1 aircraft (airframe model) - [Boeing 747-131](https://openairdocs.org/model/boeing-747-131): 1 aircraft (airframe model) - [Boeing 747-128](https://openairdocs.org/model/boeing-747-128): 1 aircraft (airframe model) - [Boeing 747-273C](https://openairdocs.org/model/boeing-747-273c): 1 aircraft (airframe model) All 24 models: https://openairdocs.org/ad/74-19-06/models.md Every aircraft: https://openairdocs.org/ad/74-19-06/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.