AD 89-03-51

89-03-51 BOEING: Amendment 39-6213. Final copy of Telegraphic Airworthiness Directive issued January 31, 1989.

Applicability: All Boeing Model 757 and 767 series airplanes, and Models 737-200, -300, and -400, and Models 747-200 and -300 series airplanes, manufactured after December 31, 1980, certificated in any category.

Compliance: Required within 25 days after the effective date of this AD, unless previously accomplished; and thereafter, compliance is required immediately following any maintenance action which could cause mis- wiring and/or mis- plumbing.

To detect incorrectly installed fire protection system plumbing and/or wiring, accomplish the following:

A. For Model 737-200, -300, and -400 series airplanes, line number 726 and subsequent: 1. Engine overheat, fire detection, and fire extinguishing systems: conduct a functional check of each system in accordance with the appropriate airplane model Boeing Telex as follows:

- For Boeing Model737-200: Telex M-7272-89-0532, dated February 8, 1989. - For Boeing Models 737-300 and -400: Telex M-7272-89-0530, dated February 6, 1989.

NOTE: Operators of Model 737-300 and 737-400 series airplanes that have previously completed a functional check of one engine's overheat and fire detection system, and a continuity check of the second engine's overheat and fire protection system to comply with AD T89-01-51, dated January 11, 1989, are only required to complete the functional check on the second engine and the fire extinguishing wiring portion of the functional test procedure identified above.

NOTE: Operators who have previously accomplished the functional checks required by this paragraph in accordance with Boeing Telex M-7272-89-0532, dated January 31, 1989 (for Model 737-200 series airplanes), or Telex M-7272-89-0516, dated January 31, 1989 (for Model 737-300 and 737-400 series airplanes), which were the service information telexes specified in telegraphic AD T89-03-51, issued January 31, 1981, are considered to have complied with the requirements of this paragraph.

B. For Model 747 series airplanes, line number 489, 494 through 496, 500 through 695, 697 through 699, 701 through 704, 706, 707, 709 through 714, 716, 718 through 720, and 724:

1. Engine fire/overheat detection and warning systems: Conduct a functional check in accordance with Boeing Telex M-7201-89-0194, dated January 31, 1989.

2. Engine fire extinguishing system wiring and plumbing: Conduct a functional check of the wiring and plumbing in accordance with Boeing Telex M-7201-89-0200, dated January 31, 1989, as corrected by Boeing Telex M-7201-89-0284, dated February 14, 1989, for Pratt and Whitney engines; as corrected by Boeing Telex M-7201-89-0285, dated February 14, 1989, for GE CF6-45/50 engines; and as corrected by Boeing Telex M- 7201-89-0290, dated February 15, 1989, for GE CF6-80C2 engines. The plumbing functional check applies only to airplanes equipped with General Electric CF6 engines.

3. Cargo compartment smoke detection system: Conduct a functional check in accordance with Boeing Telex M-7201-89-0197, dated January 31, 1989, as corrected by Boeing Telex M-7201-89-0304, dated February 17, 1989.

4. Cargo compartment fire extinguishing system: Conduct a functional check of the wiring in accordance with Boeing Telex M-7201-89-0195, dated January 31, 1989; and of the plumbing in accordance with Boeing Telex M-7201-89-0195, dated January 31, 1989.

NOTE: Operators who have previously accomplished the functional checks required by this paragraph, in accordance with Boeing Telex M-7201-89-0200, dated January 31, 1989; Telex M-7201-89-0197, dated January 31, 1989; or Telex M-7201-89-0195, dated January 31, 1989; as appropriate, which were the service information telexes specified in telegraphic AD T89-03-51, issued January 31, 1989, are considered to have complied with the requirements of this paragraph.

C. For all Model 757 series airplanes:

1. Engine overheat, fire detection, and fire extinguishing systems: Conduct a functional check of each system in accordance with Boeing Telex M-7272-89-0531, dated February 8, 1989.

2. Cargo compartment smoke detection system: Conduct a functional check in accordance with Boeing Telex M-7272-89-0531, dated February 8, 1989.

3. Cargo compartment fire extinguishing system: Conduct a functional check of the wiring in accordance with Boeing Telex M-7272-89-0185, dated January 13, 1989, or Boeing Telex M-7272-89-0531 dated February 8, 1989; and of the plumbing in accordance with Boeing Telex M-7272-89-0531, dated February 8, 1989.

NOTE: Operators who have previously accomplished the functional checks required by this paragraph in accordance with Boeing Telex M-7272-89-0531, dated January 31, 1989, which was the service information telex specified in telegraphic AD T89-03-51, issued January 31, 1989, are considered to have complied with the requirements of this paragraph.

D. For all Model 767 series airplanes:

1. Engine overheat and fire detection systems: Conduct a functional check in accordance with Boeing Telex M-7201-89-0196, dated January 31, 1989, as corrected by Boeing Telex M-7201-89-0271, dated February 13, 1989.

NOTE: Operators who have previously accomplished the functional checks required by this paragraph in accordance with Boeing Telex M-7201-89-0196, dated January 31, 1989, which was the service information telex specified in telegraphic AD T89-03-51, issued January 31, 1989, are considered to have complied with the requirements of this paragraph.

2. Engine fire extinguishing system: Conduct a functional check of the wiring in accordance with Boeing Telex M-7201-89-0199, dated January 31, 1989; and of the plumbing in accordance with Boeing Telex M-7201-89-0199, dated January 31, 1989.

3. Lower cargo compartment smoke detection system: Conduct a functional check in accordance with Boeing Telex M-7201-89-0201, dated January 31, 1989.

4. Cargo compartment fire extinguishing system: Conduct a functional check of the wiring in accordance with Boeing Telex M-7201-89-0198, dated January 31, 1989; and of the plumbing in accordance with AD 88-13-04, Amendment 39-5947.

E. Within 10 days after accomplishing the initial checks required by paragraphs A. through D., above, submit a report of the complete description of findings of each check from which it is determined that the wiring and/or plumbing is not configured correctly, to: Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region, 17900 Pacific Highway South, C-68966, Seattle, Washington 98168; rapid fax: (206) 431-1913; telex 756366.

F. If any discrepancy is detected during the functional tests required by paragraphs A. through D., above, correction of the anomaly must be completed prior to further flight.

G. 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 FAA Principal Maintenance Inspector (PMI), who will either concur or comment, and then send it to the Manager, Seattle Aircraft Certification Office.

H. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for accomplishment of the inspections required by 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.

Portions of this Amendment 39-6213 were effective earlier to all recipients of Telegraphic AD T89-03-51, dated January 31, 1989, which superseded TAD T89-01-51, issued January 11, 1989, TAD T89-01-52, issued January 13, 1989, and TAD T89-02-51 issued January 19, 1989.

This amendment (39-6213, AD 89-03-51) becomes effective on May 26, 1989.