# AD 68-25-02: Circuit Card - Type: Airworthiness directive - Status: Current - Products: Boeing 737-100 Series, 737-200 Series, 737-200C Series, 737-300 Series, 737-400 Series, 737-500 Series, 737-600 Series, 737-700 Series and 737-800 Series - Effective: December 10, 1968 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-689 - Registered aircraft: 823 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2779BEEA35FD53138625682E00638D61.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/68-25-02 ## The airworthiness directive 68-25-02 BOEING: Amendment 39-689. Applies to all Model B737 Series Airplanes. Compliance required as indicated: (1) Prior to next flight, unless already accomplished, use a screwdriver to assure that mounting screws holding M360 printed circuit card are tight. (2) If screws holding M360 printed circuit card are not tight, replace NAS 1068 nutplates with self-locking nuts NAS 679A08W. (3) Within the next 50 hours' time in service after the effective date of this AD, unless previously accomplished, replace NAS 1068 nutplates with self-locking nuts NAS 679A08W and make certain that receptacle D1136 is secure. (4) Within the next 400 hours' time in service after the effective date of this AD, unless already accomplished, modify the interphone power circuits to separate the captain's and first officer's power sources and provide dual power sources to each interphone system in accordance with the section entitled "II. Accomplishment Instructions", of Boeing Service Bulletin 24-1009, Revision 1, November 8, 1968, or later FAA approved revision thereof, or an equivalent modification approved by the Chief, Aircraft Engineering Division, FAA Western Region. This amendment becomes effective, insofar as compliance requirements (1), (2) and (3) are concerned, upon publication in the FEDERAL REGISTER for all persons except those to whom these requirements were made effective immediately by telegram dated November 1, 1968. This amendment becomes effective, insofar as compliance requirement (4) is concerned, for all persons on December 10, 1968. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A16WE](https://openairdocs.org/tcds/A16WE): The Boeing Company; names 9 of 17 models: 737-500 Series, 737-100 Series, 737-200C Series, 737-800 Series, 737-300 Series, 737-200 Series, 737-700 Series, 737-400 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: 823 (823 by airframe model, 0 by engine model) - Makers: Boeing 823 Models with the most aircraft: - [Boeing 737-823](https://openairdocs.org/model/boeing-737-823): 278 aircraft (airframe model) - [Boeing 737-800](https://openairdocs.org/model/boeing-737-800): 139 aircraft (airframe model) - [Boeing 737-824](https://openairdocs.org/model/boeing-737-824): 135 aircraft (airframe model) - [Boeing 737-832](https://openairdocs.org/model/boeing-737-832): 73 aircraft (airframe model) - [Boeing 737-890](https://openairdocs.org/model/boeing-737-890): 60 aircraft (airframe model) - [Boeing 737-724](https://openairdocs.org/model/boeing-737-724): 36 aircraft (airframe model) - [Boeing 737-790](https://openairdocs.org/model/boeing-737-790): 14 aircraft (airframe model) - [Boeing 737-752](https://openairdocs.org/model/boeing-737-752): 13 aircraft (airframe model) - [Boeing 737-400](https://openairdocs.org/model/boeing-737-400): 8 aircraft (airframe model) - [Boeing 737-852](https://openairdocs.org/model/boeing-737-852): 7 aircraft (airframe model) - [Boeing 737-500](https://openairdocs.org/model/boeing-737-500): 6 aircraft (airframe model) - [Boeing 737-436](https://openairdocs.org/model/boeing-737-436): 6 aircraft (airframe model) - [Boeing 737-700](https://openairdocs.org/model/boeing-737-700): 5 aircraft (airframe model) - [Boeing 737-300](https://openairdocs.org/model/boeing-737-300): 4 aircraft (airframe model) - [Boeing 737-883](https://openairdocs.org/model/boeing-737-883): 4 aircraft (airframe model) - [Boeing 737-205](https://openairdocs.org/model/boeing-737-205): 3 aircraft (airframe model) - [Boeing 737-490](https://openairdocs.org/model/boeing-737-490): 3 aircraft (airframe model) - [Boeing 737-484](https://openairdocs.org/model/boeing-737-484): 3 aircraft (airframe model) - [Boeing 737-732](https://openairdocs.org/model/boeing-737-732): 3 aircraft (airframe model) - [Boeing 737-524](https://openairdocs.org/model/boeing-737-524): 3 aircraft (airframe model) All 40 models: https://openairdocs.org/ad/68-25-02/models.md Every aircraft: https://openairdocs.org/ad/68-25-02/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.