AD 91-13-10 R1

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AD Number:
91-13-10 R1
Document Type:
AD Final Rules
Docket Number:
91-NM-241-AD
Subject Heading:
Airworthiness Directives; BOEING Model 747 Series Airplanes
Subject:
EICAS Computer
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
02/26/1992
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Superseded AD: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Superseded By: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: 91-13-10 R1
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   91-NM-241-AD

AMENDMENT:   39-8158

AD NUMBER:   91-13-10 R1

SUBJECT HEADING:   Airworthiness Directives; BOEING Model 747 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective February 26, 1992.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
91-13-10 R1 BOEING: Amendment 39-8158. Docket No. 91-NM-241-AD. Revises AD 91-13-10, Amendment 39- 7041.

Applicability: Model 747 series airplanes equipped with Pratt and Whitney PW4000 engines; and Model 767 series airplanes equipped with Pratt and Whitney PW4000, General Electric CF6-80C2-B2F, or General Electric CF6- 80C2-B6F series engines; certificated in any category.

Compliance: Required as indicated, unless previously accomplished.
To prevent overspeed or uncommanded shutdown of an engine, accomplish the following:

(a) For Model 747 series airplanes equipped with Pratt and Whitney PW4000 engines, and Model 767 series airplanes equipped with Pratt and Whitney PW4000 or General Electric CF6-80C2-B6F engines: Within 3 days after May 22, 1989 (the effective date of Amendment 39-6210), add the following 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.

"Prior to each departure, with all engines running, refer to the EICAS status page and determine the dispatch capability of the aircraft."

(b) Within the next 24 months after August 12, 1991 (the effective date of this Amendment 39-7041), replace the EICAS computers in accordance with the appropriate service bulletin listed below. After replacement of the EICAS computers in accordance with the specified service bulletins, the AFM limitation required by paragraph (a) of this AD may be removed.

(1) For Model 747 series airplanes listed in Boeing Service Bulletin 747-31-2151, dated March 29, 1990.

(2) For Model 767 series airplanes equipped with Pratt and Whitney PW4000 engines listed in Boeing Service Bulletin 767-31-0033, Revision 1, dated September 27, 1990.

(3) For Model 767 series airplanes equipped with General Electric CF6-80C2-B6F engines listed in Boeing Service Bulletin 767-31-0038, dated April 12, 1990.

(c) For Model 767 series airplanes equipped with General Electric CF6-80C2-B2F engines:

(1) Within the next 3 days after the effective date of this AD, add the following 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.

"Prior to each departure, with all engines running, refer to the EICAS status page and determine the dispatch capability of the aircraft."

(2) Within the next 24 months after the effective date of this AD, replace the EICAS computers in accordance with Boeing Service Bulletin 767-31-0038, dated April 12, 1990. After incorporation of the EICAS computers, the AFM limitation required by paragraph (c)(1) may be removed.

(d) For airplanes not subject to paragraph (b) or (c) of this AD, within the next 30 days after the effective date of this AD, remove the AFM limitation required by paragraph (a) of this AD.

(e) 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.

(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.

(g) The replacement requirements shall be done in accordance with the following Boeing Service Bulletins, which incorporate the following list of affected pages:

Service Bulletin Revision Level Date Pages
747-31-2151	Original	March 29, 1990	1 - 10
767-31-0033	1
Original	September 27, 1990 May 31, 1990	1, 2, 4, 5
3, 6, 7, 8,
9, 10
767-31-0038	Original	April 12, 1990	1 - 8
			

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, D.C.

(h) Airworthiness Directive 91-13-10 superseded AD 89-10-06, Amendment 39-6210.
(i) This Airworthiness Directive 91-13-10 R1 revises AD 91-13-10, Amendment 39-7041.
(j) This amendment (39-8158, AD 91-13-10 R1) becomes effective on February 26, 1992.


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