AD 89-02-10 R1

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.