AD 90-06-04

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AD Number:
90-06-04
Document Type:
AD Final Rules
Docket Number:
90-NM-18-AD
Subject Heading:
Airworthiness Directives; BOEING Model 737 Series Airplanes
Subject:
APU Fire Detection System
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
03/19/1990
Make:
The Boeing Company
Model:
737-100 Series | 737-200 Series | 737-200C Series | 737-300 Series | 737-400 Series | 737-500 Series...Show more
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 90-06-04
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   90-NM-18-AD

AMENDMENT:   39-6522

AD NUMBER:   90-06-04

SUBJECT HEADING:   Airworthiness Directives; BOEING Model 737 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective March 19, 1990.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
90-06-04 BOEING: Amendment 39-6522. Docket No. 90-NM-18-AD.

Applicability: All Model 737 series airplanes, equipped with Walter Kidde APU fire detection systems that either have not yet had an initial "C" check performed or that have had an APU replaced since performing the last "C" check, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent an undetected APU fire, accomplish the following:

A. Within 3 days after the effective date of this AD, placard the APU as inoperative until the inspection required by paragraph B., below, has been accomplished.

B. Within 5 days after installation of the placard required by paragraph A., above, inspect to determine whether a Walter Kidde APU fire detector is installed in the APU compartment. This inspection can be performed by viewing through the APU cooling air exhaust outlet (ref: Model 737 Maintenance Manual 49-11-00). The Walter Kidde element is protected by a perforated shield surrounding the length of the element. If the perforated shield is not seen, open the lower APU shroud and verify that the fire detector element installed is Boeing Part Number 10-61096-316/Walter Kidde part number 894481.

NOTE: Boeing Model 737-300 and 737-400 series airplanes inspected in accordance with Boeing Telex M-7272-90-0735, dated January 31, 1990, comply with the inspection requirements of this AD.

C. If configuration discrepancies are discovered while accomplishing the inspection required by paragraph B., above, within 5 days, remove and replace the detector with the appropriate Walter Kidde detector that has been approved for installation on the airplane. Upon completion of the inspection required by paragraph B. and this modification, if required, the placard required by paragraph A., above, may be removed.

D. Within 10 days after the inspection required by paragraph B., above, if configuration discrepancies are discovered, submit a report of findings to the Manager, Seattle Manufacturing Inspection District Office, ANM-108S, FAA, Transport Airplane Directorate, 7300 Perimeter Road South, Seattle, Washington 98108. The report must include the airplane serial number.

E. 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), who will either concur or comment and then send it to the Manager, Seattle Aircraft Certification Office.

F. 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.

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 Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6522, AD 90-06-04) becomes effective on March 19, 1990.

FOOTER: