AD 89-11-01

89-11-01 BOEING: Amendment 39-6208. Applicability: Model 737-300 series airplanes not equipped with Electronic Flight Instrument System (EFIS), certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To preclude the possibility of loss of the primary attitude display to both pilots during Instrument Meteorological Conditions (IMC) or during extended range flight, accomplish the following:

A. Within 10 days after the effective date of this AD, inspect the Inertial Reference Units (IRU) installed to determine the part number and modification status.

1. If both are part number S242T101-103 and neither have Mod 6 implemented, add the following restriction to the Limitations Section of the FAA-approved Airplane Flight Manual (AFM). This may be accomplished by inserting a copy of this AD in the AFM:

a. "Instrument approach conditions are restricted to a 1000 foot ceiling and 3 miles visibility."

b. "No Extended Range Operations (ETOPS)."

2. If one IRU is part number S242T101-103 without Mod 6 implemented, and the other IRU either has Mod 6 or is an approved part number other than S242T101-103, add the following restriction to the Limitations Section of the FAA-approved Airplane Flight Manual (AFM). This may be accomplished by inserting a copy of this AD in the AFM:

a. "Instrument approach minimums are restricted to a 200 foot Decision Height (DH) and 1800 Runway Visual Range (RVR), (Category I)."

b. "No Extended Range Operations (ETOPS)."

3. Install a placard on the control cabin center instrument panel clearly defining the appropriate limitation applicable to each airplane, as required by paragraphs A.1. and A.2., above. A placard restricting ETOPS is not required if ETOPS has not been approved for the airplane. Placard wording and location shall be approved by an FAA Principal Operations Inspector (POI).

B. The limitations on each airplane, as requiredby paragraph A., above, shall remain in effect until both IRU's, P/N S242T101-103, have been modified in accordance with Honeywell Service Bulletin HG1050AD-34-04, dated December 1, 1987, or Honeywell Service Bulletin HG1050AD-34-03, Revision A, dated February 15, 1989, or have been replaced by IRU P/N S242T101-105.

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, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI) or Principal Operations Inspector (POI), as appropriate, who will either concur or comment, and then send it to the Manager, Seattle 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 to comply with the requirements of this AD.

All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification Office, FAA, Northwest Mountain Region, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6208, AD 89-11-01) becomes effective on May 22, 1989.