AD 89-10-08

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AD Number:
89-10-08
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; AEROSPATIALE Model ATR-42 Series Airplanes
Subject:
Navigation Equipment
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
06/09/1989
Make:
ATR - GIE Avions de Transport R gional
Model:
ATR42-200 | ATR42-300 | ATR42-320 | ATR42-500
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Superseded AD: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Superseded By: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: 89-10-08
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-6205

AD NUMBER:   89-10-08

SUBJECT HEADING:   Airworthiness Directives; AEROSPATIALE Model ATR-42 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective June 9, 1989.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
89-10-08 AEROSPATIALE: Amendment 39-6205.

Applicability: Model ATR-42 series airplanes, Serial Numbers 003 through 093, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent improper functioning of Honeywell-Sperry navigation equipment and to prevent incompatible combinations of this equipment, accomplish the following:

A. Within 10 days after the effective date of this AD, accomplish the following in accordance with Aerospatiale Service Bulletin ATR42-34-0027, dated April 6, 1988:

1. Inspect Honeywell-Sperry Symbol Generator Units (SGU) for unauthorized mixing of units in accordance with paragraph C.(1) of the service bulletin. Correct any unauthorized mixing of units prior to further flight.

2. Inspect Honeywell-Sperry navigation equipment for unauthorized mixing of Attitude Heading Reference Units (AHRU) and SGU in accordance with paragraphs C.(2) and C.(3) of the service bulletin. For airplanes with unauthorized mixing of AHRU and SGU, prior to further flight, insert the following into the Limitations Section 2 of the Airplane Flight Manual (AFM). This can be accomplished by inserting a copy of this AD into the AFM and into the Flight Crew Operations Manual:

"Approach operations are limited to Category 1 or higher weather minima."

Operate the airplane in accordance with this limitation until the requirements of paragraph B. of this AD are accomplished, at which time this limitation may be removed from the AFM.

B. Within 120 days after the effective date of this AD, accomplish the following:

1. Replace the Digital Air Data Computer (DADC), in accordance with Aerospatiale Service Bulletin ATR42-34-0024, Revision 1, dated August 30, 1988.

2. Replace the Attitude Heading Reference System (AHRS), in accordance with Aerospatiale Service Bulletin ATR42-34-0025, Revision 1, dated August 30, 1988.

3. Replace the Symbol Generator Units (SGU), in accordance with Aerospatiale Service Bulletin ATR42-34-0026, Revision 1, dated August 30, 1988.

C. 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, Standardization Branch, ANM-113, FAA, Northwest Mountain Region.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who may add any comments and then send it to the Manager, Standardization Branch, ANM-113.

D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of the requirements of this AD.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Aerospatiale, 316 Route de Bayonne, 31060 Toulouse, Cedex 03, France. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or at the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington.

This amendment (39-6205, AD 89-10-08) becomes effective on June 9, 1989.

FOOTER: