AD 91-22-05

91-22-05 BOEING: Amendment 39-8065. Docket No. 91-NM-55-AD.

Applicability: Model 747 series airplanes, line numbers 001 through 708, except Model 747-400 and freighters, certificated in any category.

Compliance: Required within 36 months after the effective date of this AD, unless previously accomplished.

To prevent injury to passengers and flight attendants, accomplish the following:

(a) For airplanes listed in Boeing Service Bulletin 747-25-2734, Revision 1, dated May 25, 1989:

(1) For those stowage bins used for stowage, accomplish the following in accordance with Section III of Boeing Service Bulletin 747-25-2734, dated November 3, 1988, or Revision 1, dated May 25, 1989:

(i) Replace the overhead stowage compartment doors and counterbalance assemblies;

(ii) Rework and adjust compartments;

(iii) Install new wiring provisions; and

(iv) Perform operational checks of associated equipment.

(2) For those bins that are notused for stowage of any item, in lieu of the procedures required by paragraph (a)(1) of this AD, operators may accomplish the following:

(i) Conduct a visual inspection of the existing latches for wear of the latching handle locking grooves and ensure full travel of the latch pins. If wear or other discrepancies are indicated, repair in accordance with FAA-approved procedures.

(ii) Install a placard indicating "NO STOWAGE;" and

(iii) Disable the bin to prevent its opening, in a manner approved by the FAA Principal Maintenance Inspector.

(b) For airplanes not listed in Boeing Service Bulletin 747-25-2734, Revision 1, dated May 25, 1989:

(1) For those stowage bins used for stowage, accomplish the following in a manner similar to that described in the service bulletin and approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate:

(i) Replace the overhead stowage compartment doors and counterbalance assemblies;

(ii) Rework and adjust compartments;

(iii) Install new wiring provisions; and

(iv) Perform operational checks of associated equipment.

(2) For those bins that are not used for stowage of any item, in lieu of the procedures required by paragraph (b)(1) of this AD, operators may accomplish the following:

(i) Conduct a visual inspection of the existing latches for wear of the latching handle locking grooves and ensure full travel of the latch pins. If wear or other discrepancies are indicated, repair, in accordance with FAA-approved procedures.

(ii) Install a placard indicating "NO STOWAGE;" and

(iii) Disable the bin to prevent its opening, in a manner approved by the FAA Principal Maintenance Inspector.

(c) An alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Seattle ACO, FAA, Transport Airplane Directorate.

NOTE:The request should be forwarded through an FAA Principal Maintenance Inspector (PMI) who may concur or comment and then sent it to the Manager, Seattle ACO.

(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.

(e) The requirements for replacement, rework and adjustment, inspections, and operational checks shall be done in accordance with Boeing Service Bulletin 747-25-2734, dated November 3, 1988; or in accordance with Boeing Service Bulletin 747-25-2734, Revision 1, dated May 25, 1989, which includes the following list of effective pages:

PAGE NUMBER REVISION LEVEL

DATE 1-2, 4, 7, 9-13, 17-27, 76-77

1 May 25, 1989 3, 5-6, 8, 14-16, 28-75, 78-83 (Original) November 3, 1988

This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. Copies may be inspected at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington, or at the Office of the Federal Register, 1100 L Street NW., Room 8401, Washington, D.C.

This amendment (39-8065, AD 91-22-05) becomes effective on November 29, 1991.