# AD 89-02-10 R1: Flight Management System Navigation Computers - Type: Airworthiness directive - Status: Current - Products: Bombardier CL-600-2A12 (CL-601), Mystere-Falcon 900, G-IV, BAe.125 Series 800A and Computer - Effective: October 14, 1989 - Superseded by: Nothing supersedes this AD - Product type: Appliance - Amendment: 39-6319 - Docket: 89-NM-44-AD - Registered aircraft: 603 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/00C18B780903F17886256A3800494206.0001 - DRS record last changed: January 21, 2026 - Page: https://openairdocs.org/ad/89-02-10-R1 ## The airworthiness directive 89-02-10 R1 HONEYWELL, INC.: Amendment 39-6116 as revised by Amendment 39-6319. (Docket No. 89-NM-44-AD) Applies to Sperry FMZ-800 Flight Management System (FMS) navigation computers, part numbers 7004402-801, -811, or -832. These FMS computers are known to be or have been installed in, but not limited to, Avions Marcel Dassault Model Mystere-Falcon 900, British Aerospace Model BAe-125-800A, Canadair Model CL-601, and Gulfstream Model G-IV series airplanes. Compliance: Required as indicated, unless previously accomplished. To prevent FMS position jumps while crossing the 180 degree meridian, accomplish the following: A. Within 15 days after February 6, 1989 (the effective date of Amendment 39-6116), on aircraft equipped with three inertial reference systems (IRS), add the following to the Limitations Section of the FAA-approved Airplane Flight Manual (AFM), or the FAA-approved Airplane Flight Manual Supplement (AFMS). This may be accomplished by inserting a copy of this AD in the AFM or AFMS. IF FLIGHT ACROSS THE 180 DEGREE MERIDIAN IS INTENDED, THE THIRD INERTIAL REFERENCE SYSTEM MUST BE OPERATED IN THE "ATT" MODE. B. Within 60 days of the effective date of this amendment, regardless of the number of IRS's installed, replace the FMS navigation computers, as follows: 1. Replace Honeywell P/N 7004402-801 (software configuration DEL-8N) computers with P/N 7004402-803 (software configuration DEL 10J), -804, -806, or -906 (software configuration NZ-8804) computers. 2. Replace Honeywell P/N 7004402-811 (software configuration DEL-9S) computers with P/N 7004402-813 or -903 (software configuration DEL-10P) computers. 3. Replace Honeywell P/N 7004402-832 (software configuration DEL-9T) computers with P/N 7004402-833 or -904 (software configuration NZ-8801) computers. After these replacements have been accomplished on those aircraft with three IRS's, the AFM or AFMS limitation, required by paragraph A., above, may beremoved, and the third IRS may be operated normally. C. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region. NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment and then send it to the Manager, Los Angeles Aircraft Certification Office. D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. This amendment (39-6319) amends Amendment 39-6116, AD 89-02-10 which became effective on February 6, 1989. This amendment (39-6319) becomes effective on October 14, 1989. ## Affected data sheets (4) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A12EA](https://openairdocs.org/tcds/A12EA): Gulfstream Aerospace Corporation; names 1 of 7 models: G-IV - [TCDS A21EA](https://openairdocs.org/tcds/A21EA): Bombardier Inc.; names 1 of 5 models: CL-600-2A12 (601) - [TCDS A3EU](https://openairdocs.org/tcds/A3EU): Textron Aviation Inc.; names 1 of 50 models: BAe.125 Series 800A (U-125) - [TCDS A46EU](https://openairdocs.org/tcds/A46EU): Dassault Aviation; names 1 of 3 models: Mystere-Falcon 900 ## 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: 603 (603 by airframe model, 0 by engine model) - Makers: Gulfstream Aerospace 369, Dassault-Breguet 73, British Aerospace 66, Dassault 52, Canadair 20, Corporate Jets 8, Raytheon Corporate Jets 8, Avions Marcel Dassault 4, Raytheon 2, Bombardier 1 Models with the most aircraft: - [Gulfstream Aerospace G-IV](https://openairdocs.org/model/gulfstream-aerospace-g-iv): 357 aircraft (airframe model) - [Dassault-Breguet MYSTERE FALCON 900](https://openairdocs.org/model/dassault-breguet-mystere-falcon-900): 73 aircraft (airframe model) - [British Aerospace BAE 125 SERIES 800A](https://openairdocs.org/model/british-aerospace-bae-125-series-800a): 61 aircraft (airframe model) - [Dassault MYSTERE FALCON 900](https://openairdocs.org/model/dassault-mystere-falcon-900): 52 aircraft (airframe model) - [Canadair CL-600-2A12](https://openairdocs.org/model/canadair-cl-600-2a12): 19 aircraft (airframe model) - [Corporate Jets BAE 125-800A](https://openairdocs.org/model/corporate-jets-bae-125-800a): 8 aircraft (airframe model) - [Gulfstream Aerospace G-IV (G400)](https://openairdocs.org/model/gulfstream-aerospace-g-iv-g400): 8 aircraft (airframe model) - [Raytheon Corporate Jets BAE 125-800A](https://openairdocs.org/model/raytheon-corporate-jets-bae-125-800a): 8 aircraft (airframe model) - [British Aerospace BAE 125-800A](https://openairdocs.org/model/british-aerospace-bae-125-800a): 5 aircraft (airframe model) - [Avions Marcel Dassault MYSTERE FALCON 900](https://openairdocs.org/model/avions-marcel-dassault-mystere-falcon-900): 4 aircraft (airframe model) - [Gulfstream Aerospace G-IV (G350)](https://openairdocs.org/model/gulfstream-aerospace-g-iv-g350): 2 aircraft (airframe model) - [Gulfstream Aerospace G-IV (G300)](https://openairdocs.org/model/gulfstream-aerospace-g-iv-g300): 2 aircraft (airframe model) - [Raytheon BAE 125-800A](https://openairdocs.org/model/raytheon-bae-125-800a): 2 aircraft (airframe model) - [Bombardier CL-600-2A12](https://openairdocs.org/model/bombardier-cl-600-2a12): 1 aircraft (airframe model) - [Canadair CL-600-2A12(CL-601)](https://openairdocs.org/model/canadair-cl-600-2a12-cl-601): 1 aircraft (airframe model) All 16 models: https://openairdocs.org/ad/89-02-10-R1/models.md Every aircraft: https://openairdocs.org/ad/89-02-10-R1/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.