AD 64-19-06

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AD Number:
64-19-06
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; VERTOL Models 42A, 42B (Military H21B, H21C), 44A and 44B Helicopters
Subject:
Spiral Bevel Pinion Gears
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
08/07/1964
Effective Date:
08/07/1964
Make:
Boeing Defense & Space Group | Wright Kevin | Marrs Joe G. | Risley Lester W.
Model:
42A | 42B | 44A | 44B | H-21B
Product Type:
Aircraft
Product Subtype:
Rotorcraft
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
AIR-700: Compliance & Airworthiness Division
Office of Primary Responsibility:
AIR-720: Operational Safety Branch
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 64-19-06
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   64-19-06

SUBJECT HEADING:   Airworthiness Directives; VERTOL Models 42A, 42B (Military H21B, H21C), 44A and 44B Helicopters

ACTION:  

SUMMARY:  

DATES:   Effective August 7, 1964.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
64-19-06 VERTOL: Amdt 782 Part 507 Federal Register August 7, 1964. Applies to Models 42A, 42B (Military H21B, H21C), 44A and 44B Helicopters.

Compliance required as indicated.

A spiral bevel pinion gear P/N 42D2043-2 installed in an aft transmission of a Vertol Model 42/44 Series helicopter recently failed. The nature of the failure indicated that metallurgical processing was a contributing factor. The gears listed herein were manufactured in the same carburizing and heat treat lot. These gears must be removed from service and replaced as follows:

(a) Remove from service any spiral bevel pinion gear P/N 42D2043-2 listed in paragraph (b) and replace it in accordance with the V44-28 rotor transmission overhaul manual at the following times:

(1) Within 10 hours' time in service after the effective date of this AD for those gears which have 500 or more hours' time in service on the effective date of this ad.

(2) Within 50 hours' time in service after the effective date of this AD for those gears which have less than 500 hours' time in service on the effective date of this AD.

(b) The following spiral bevel pinion gears P/N 42D2043-2 shall be removed from service in accordance with paragraph (a):


Gear S/N - P2009; Aft Transmission S/N - P-9-1653
Gear S/N - P2008; Aft Transmission S/N - P-9-1665
Gear S/N - P2001; Aft Transmission S/N - P-9-1657
Gear S/N - P1999; Aft Transmission S/N - P-9-1640
Gear S/N - P1997; Aft Transmission S/N - P-9-1646
Gear S/N - P1977; Aft Transmission S/N - P-9-1642
Gear S/N - P1972; Aft Transmission S/N - P-9-1405
Gear S/N - P2007
Gear S/N - P1995
Gear S/N - P1962
Gear S/N - P1961

NOTE. - It is believed that the aft transmission S/N's listed above have the corresponding gear S/N listed. It is not known which aft transmission S/N's may have the remaining listed gear S/N's.

(Vertol Division Technical Memorandum SDTM No. 2059 dated May 19, 1964, covers this subject.)

This directive effective August 7, 1964.

FOOTER: