AD 91-07-01

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AD Number:
91-07-01
Document Type:
AD Final Rules
Docket Number:
91-NM-45-AD
Subject Heading:
Airworthiness Directives; BOEING Model 737 Series Airplanes
Subject:
Electronic Flight Instrument System Symbol Generators
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
04/03/1991
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Superseded AD: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Superseded By: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: 91-07-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   91-NM-45-AD

AMENDMENT:   39-6945

AD NUMBER:   91-07-01

SUBJECT HEADING:   Airworthiness Directives; BOEING Model 737 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective April 3, 1991.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
91-07-01 BOEING: Amendment 39-6945. Docket No. 91-NM-45-AD.

Applicability: Model 737 series airplanes, line numbers 1975 through 1989; and Model 757 series airplanes, line numbers 338 through 343; equipped with an Electronic Flight Instrument System (EFIS) using symbol generators, part number S242T404-420; certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent blanking of either pilot's EFIS display and loss of one pilot's primary flight instruments, accomplish the following:

A. Within 10 days after the effective date of this AD, inspect the EFIS symbol generators installed on the airplane and record the modification status. EFIS symbol generators which do not have Modification 3 implemented, must be removed and modified in accordance with Collins Service Bulletin EFIP-701E-34-03, dated February 1, 1991, prior to further flight.

B. Any EFIS Symbol Generators with part number S242T404-420 which do not have Modification 3 implemented, must be modified in accordance with Collins Service Bulletin EFIP-701E-34-03, dated February 1, 1991, before installation on an airplane.

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

NOTE: The request should be forwarded through an FAA Principal Avionics Inspector, who may concur or comment and then send 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.

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 Airplane Group, P.O. Box 3707, Seattle, Washington 98124. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington.

This amendment (39-6945, AD 91-07-01) becomes effective on April 3, 1991.

FOOTER: