# AD 88-25-01: Distance Measuring Equipment - Type: Airworthiness directive - Status: Current - Products: BAE Systems Avro 146-RJ100A, Avro 146-RJ70A, Avro 146-RJ85A, BAe 146-100A, BAe 146-200A, BAe 146-300A, Distance Measuring Equipment, 727-100 Series, 727-100C Series, 727-200 Series, 727-200F Series, 727 Series and 39 more - Effective: December 20, 1988 - Superseded by: Nothing supersedes this AD - Product type: Appliance - Amendment: 39-6073 - Registered aircraft: 950 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CFBD9F28749BC56686256A3400624B85.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/88-25-01 ## The airworthiness directive 88-25-01 BENDIX/KING: Amendment 39-6073. Applies to Model KDM 7000B Distance Measuring Equipment (DME), Part Number 066-1019-21/-23/-26/-33/-43/-57, (Serial Numbers 21855 through and including 22526) certificated to the applicable requirements of Technical Standard Order C66a, installed in, but not limited to, Boeing 727 series, 737 series, 747 series, British Aerospace Model 146, Fokker Models F-27 and F-28, and McDonnell Douglas MD-80 series airplanes. Compliance: Required as indicated in the body of the AD, unless already accomplished. To prevent uncommanded channeling of the associated VOR/Localizer/Glideslope navigation receiver and resultant erroneous navigation data with no warning information, accomplish the following: (a) For affected KDM 7000B distance measuring equipment units, prior to installation in an aircraft, or if already installed in an aircraft, within the next 50 hours time-in-service following the effective date of this AD, modify the KDM 7000B DME in accordance with the instructions contained in Bendix/King Alert Service Bulletin KDM 7000B-34-14, dated November 4, 1988. This modification must be accomplished by a properly rated certified repair station. (b) Airplanes may be flown in accordance with Federal Aviation Regulation 21.197 to a location where this AD may be accomplished. (c) An equivalent means of compliance with this AD may be used if approved by the Manager, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas 67209. All persons affected by this directive may obtain copies of the document referred to herein upon request to Allied-Signal Aerospace Sector, Bendix/King Air Transport Avionics Division, P.O. Box 9327, Ft. Lauderdale, Florida 33310; or may examine the document referred to herein at the FAA, Office of the Assistant Chief Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106. This amendment, 39-6073, becomes effective on December 20, 1988. ## Affected data sheets (7) (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… - [TCDS A16WE](https://openairdocs.org/tcds/A16WE): The Boeing Company; names 11 of 17 models: 737-500 Series, 737-900 Series, 737-100 Series, 737-200C Series, 737-700C Series, 737-800 Series, 737-300 Series, 737-200 Series… - [TCDS A-817](https://openairdocs.org/tcds/A-817): Fokker Services B.V.; names 8 of 8 models: F27 Mark 500, F27 Mark 100, F27 Mark 700, F27 Mark 200, F27 Mark 400, F27 Mark 600, F27 Mark 050, F27 Mark 300 - [TCDS A20EU](https://openairdocs.org/tcds/A20EU): Fokker Services B.V.; names 6 of 6 models: F28 Mark 1000, F28 Mark 4000, F28 Mark 2000, F28 Mark 0070, F28 Mark 3000, F28 Mark 0100 - [TCDS A3WE](https://openairdocs.org/tcds/A3WE): The Boeing Company; names 6 of 6 models: 727-100 Series, 727 Series, 727-200 Series, 727-100C Series, 727-200F Series, 727C Series - [TCDS A49EU](https://openairdocs.org/tcds/A49EU): BAE Systems (Operations) Limited; names 6 of 6 models: Avro 146-RJ85A, BAe 146-300A, BAe 146-100A, Avro 146-RJ70A, Avro 146-RJ100A, BAe 146-200A - [TCDS A6WE](https://openairdocs.org/tcds/A6WE): The Boeing Company; names 1 of 25 models: MD-90-30 ## 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: 950 (950 by airframe model, 0 by engine model) - Makers: Boeing 925, British Aerospace 20, Mcdonnell Douglas 3, BAE Systems 2 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 737-924](https://openairdocs.org/model/boeing-737-924): 12 aircraft (airframe model) - [British Aerospace AVRO 146-RJ85A](https://openairdocs.org/model/british-aerospace-avro-146-rj85a): 12 aircraft (airframe model) - [Boeing 747-446](https://openairdocs.org/model/boeing-747-446): 10 aircraft (airframe model) - [Boeing 727-223](https://openairdocs.org/model/boeing-727-223): 9 aircraft (airframe model) - [Boeing 737-400](https://openairdocs.org/model/boeing-737-400): 8 aircraft (airframe model) - [Boeing 747-422](https://openairdocs.org/model/boeing-747-422): 8 aircraft (airframe model) - [British Aerospace BAE 146 SERIES 200A](https://openairdocs.org/model/british-aerospace-bae-146-series-200a): 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 747-412](https://openairdocs.org/model/boeing-747-412): 5 aircraft (airframe model) All 83 models: https://openairdocs.org/ad/88-25-01/models.md Every aircraft: https://openairdocs.org/ad/88-25-01/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.