AD 92-04-03

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AD Number:
92-04-03
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; BOEING Model 747 Series Airplanes
Subject:
Passenger Oxygen System
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
03/16/1992
Make:
The Boeing Company
Model:
747-100 Series | 747-100B Series | 747-100B SUD Series | 747-200B Series | 747-200C Series | 747-200...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Superseded AD: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Superseded By: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: 92-04-03
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-8172

AD NUMBER:   92-04-03

SUBJECT HEADING:   Airworthiness Directives; BOEING Model 747 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective March 16, 1992.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
92-04-03 BOEING: Amendment 39-8172. Docket 91-NM-176-AD.

Applicability: Model 747 series airplanes, as listed in Boeing Service Bulletin 747-35- 2074, dated June 27, 1991, certificated in any category.

Compliance: Required within the next 4,000 flight hours after the effective date of this AD, unless accomplished previously.

To ensure that the passenger oxygen system activates at the proper altitude, accomplish the following:

(a) Inspect the flow control units to determine the serial numbers, in accordance with Boeing Service Bulletin 747-35-2074, Revision 1, dated December 12, 1991.

(1) If the flow control unit serial number is listed in Table 1 of the service bulletin and the unit has not been reworked, prior to further flight, replace the unit and perform a low pressure leak check and a simulated automatic actuation test, in accordance with paragraph III.C. of the Accomplishment Instructions of the service bulletin.

(2) If the flow control unit serial number is not listed in Table 1 of the service bulletin, or if the unit has been reworked in accordance with paragraph III.C. of the Accomplishment Instructions of the service bulletin, no further action is necessary.

(b) 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 Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate.

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

(c) 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.

(d) The inspection, replacement, check, and test required by this AD shall be done in accordance with Boeing Service Bulletin 747-35-2074, Revision 1, dated December 12, 1991. 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, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington; or at the Office of the Federal Register, 1100 L Street NW., Room 8401, Washington, DC.

(e) This amendment (39-8172, AD 92-04-03) becomes effective on March 16, 1992.

FOOTER: