AD 77-21-01

AD Final Rules - DRS_77-21-01.html
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AD Number:
77-21-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; Bell Model 47 Helicopters
Subject:
Tail Rotor Gear Boxes
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
11/14/1977
Make:
Scotts-Bell 47 Inc
Model:
47 | 47B | 47B3 | 47D | 47D1 | 47E | 47G | 47G-2 | 47G-2A | 47G-2A-1 | 47G-3 | 47G-3B | 47G-3B-1 | 4...Show more
Product Type:
Aircraft
Product Subtype:
Rotorcraft
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 77-21-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-3054

AD NUMBER:   77-21-01

SUBJECT HEADING:   Airworthiness Directives; Bell Model 47 Helicopters

ACTION:  

SUMMARY:  

DATES:   Effective November 14, 1977.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
77-21-01 BELL HELICOPTER TEXTRON: Amendment 39-3054. Applies to all Model 47 helicopters with tail rotor gear boxes, part number 47-640-075-1 or 47-640-075-5, installed. NOTE: Retrofit kits incorporating these gear boxes or the associated internal gears and bearings delivered from Bell Helicopter Textron after December 1, 1976, have been verified to be in compliance with this airworthiness directive and will not require inspection and/or further retrofit.

Compliance is required within the next 100 hours time in service after the effective date of this Airworthiness Directive, unless already accomplished.

To minimize the possibility of loss of directional control of the helicopter resulting from failure of the bearing, part number 47-620-629-3 or 47-620-629-5, or failure of the input pinion shaft, part number 47-645-205-3, located in the tail rotor gear box, part number 47-640-075-1 or 47-640-075-7, conduct the inspection and replacement activities prescribed by paragraphs 1, 2, 2a, 2b, 3, and 4 of Bell Helicopter Textron Service Bulletin No. 47-77-1, dated February 14, 1977, or later FAA approved revision. Comments in paragraph 5 and 6 of this bulletin involving warranties, replacement part sources, or reporting activities, are not a part of this Airworthiness Directive.

After accomplishment of paragraphs 1, 2, 3, and 4 of Service Bulletin No. 47-77-1, reassemble and reinstall the tail rotor gear box in accordance with the Maintenance and Overhaul Instruction for the applicable model helicopters.

The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof, pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive, who have not already received these documents from the manufacturer, may obtain copies by requesting same from Service Manager, Bell Helicopter Textron, P.O. Box 482, Fort Worth, Texas, 76101. These documents may also be examined at Office of the Regional Counsel, Southwest Region, Federal Aviation Administration, 4400 Blue Mound Road, Fort Worth, Texas, 76106, and the Federal Aviation Administration Headquarters, 800 Independence Avenue, S.W., Washington, D.C., 20591.

Equivalent means of compliance with the modifications prescribed by this Airworthiness Directive may be approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, Federal Aviation Administration, P.O. Box 1689, Fort Worth, Texas, 76101.

This amendment becomes effective November 14, 1977.

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