AD 74-02-01

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AD Number:
74-02-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; Bell Model 205A-1 and 212 Helicopters
Subject:
Tail Rotor Trunnion Bearings
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
02/22/1974
Make:
Bell Helicopter Textron, Inc.
Model:
205A-1 | 212
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Superseded AD: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Superseded By: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: 74-02-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-1769

AD NUMBER:   74-02-01

SUBJECT HEADING:   Airworthiness Directives; Bell Model 205A-1 and 212 Helicopters

ACTION:  

SUMMARY:  

DATES:   Effective February 22, 1974.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
74-02-01 BELL: Amdt. 39-1769. Applies to Model 205A-1 and 212 helicopters, certificated in all categories, equipped with tail rotor hub assembly, P/N 212-010-701.

Compliance required within the next 25 hours' time in service after the effective date of this A.D., unless already accomplished within the last 25 hours' time in service, and thereafter at intervals not to exceed 25 hours' time in service from the last inspection.

To detect possible cracks or excessive looseness in the tail rotor trunnion bearings, accomplish the following:

(a) Using a 3 power magnifying glass, inspect the trunnion bearing (P/N 212-010- 723-1 or P/N 212-010-768-1) exposed outer races for cracking.

(b) To detect any axial looseness in the trunnion bearings, grasp the hub assembly and attempt to move it towards and away from the tail boom fin assembly. If trunnion bearing movement is considered excessive, remove the tail rotor hub and blade assembly. Measure the amount of axial play in each trunnion bearing using a dial indicator.

(c) If there is evidence of either trunnion bearing outer race cracking or axial play in excess of the maximum allowable .015 inch, replace the affected bearing in accordance with the instructions contained in Bell Model 212 Overhaul Manual, dated May 1, 1972, Chapter-Section 65-20-01.

(Bell Helicopter Company Service Bulletin Nos. 205-05-73-5, dated August 23, 1973, and 212-05-73-4, dated August 20, 1973, pertain to this subject.)

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 upon request to the Service Manager, Bell Helicopter Company, P. O. Box 482, Fort Worth, Texas 76101. These documents may also be examined at the Office of the Regional Counsel, Southwest Region, FAA, 4400 Blue Mound Road, Fort Worth, Texas, and at FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C. A historical file on this A.D. which includes the incorporated material in full is maintained by the FAA at its headquarters in Washington, D.C., and at the Southwest Regional Office in Fort Worth, Texas.

This amendment becomes effective February 22, 1974.

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