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2010-09-24
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Airworthiness Directives; Bell Helicopter Textron, Inc. Model 412 Helicopters
Proposed Rules
D09002ee1be02bf1b
D09002ee1be02bfb6
United States
Department of Transportation
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United States Government Agency or Subagency
This document proposes the supersedure of an existing priority letter airworthiness directive (AD), applicable to certain Bell Helicopter Textron, Inc. Model 412 helicopters, that currently requires a daily inspection of certain swashplate support assemblies. It also requires a reduction in V<INF>NE, and installation of appropriate airspeed indicator markings and a placard. This action would require the same actions required by the existing Priority Letter AD, but would restrict the applicability to the Model 412 helicopters with a certain steel main rotor control swashplate support assembly (steel swashplate support assembly) installed. This AD also proposes to allow the installation of an improved main rotor control swashplate assembly that terminates the requirements of this AD. This proposal is prompted by reported cracks and in-service failures of certain steel swashplate support assemblies. The actions specified by the proposed AD are intended to prevent failure of the steel swashplate support assembly that could result in loss of main rotor control and subsequent loss of control of the helicopter.
61 FR 55231
https://www.govinfo.gov/app/details/FR-1996-10-25/96-27393
96-27393
fr25oc96-18
4910-13-U
Docket No. 96-SW-17-AD
https://www.govinfo.gov/app/details/FR-1996-10-25/96-27393
https://www.govinfo.gov/content/pkg/FR-1996-10-25/html/96-27393.htm
https://www.govinfo.gov/content/pkg/FR-1996-10-25/pdf/96-27393.pdf
3 p.
55231
55233
61 FR 55231
Code of Federal Regulations
Title 14 Part 39
14 CFR Part 39
Airworthiness Directives; Bell Helicopter Textron, Inc. Model 412 Helicopters; Federal Register Vol. 61, Issue
PRORULE
96-27393
DEPARTMENT OF TRANSPORTATION
1996-12-24
Docket No. 96-SW-17-AD
4910-13-U
96-27393
Notice of proposed rulemaking (NPRM).
This document proposes the supersedure of an existing priority letter airworthiness directive (AD), applicable to certain Bell Helicopter Textron, Inc. Model 412 helicopters, that currently requires a daily inspection of certain swashplate support assemblies. It also requires a reduction in V<INF>NE, and installation of appropriate airspeed indicator markings and a placard. This action would require the same actions required by the existing Priority Letter AD, but would restrict the applicability to the Model 412 helicopters with a certain steel main rotor control swashplate support assembly (steel swashplate support assembly) installed. This AD also proposes to allow the installation of an improved main rotor control swashplate assembly that terminates the requirements of this AD. This proposal is prompted by reported cracks and in-service failures of certain steel swashplate support assemblies. The actions specified by the proposed AD are intended to prevent failure of the steel swashplate support assembly that could result in loss of main rotor control and subsequent loss of control of the helicopter.
Comments must be received by December 24, 1996.
Mr. Charles Harrison, Federal Aviation Administration, Southwest Region, Rotorcraft Certification Office, ASW- 170, Fort Worth, Texas 76193-0170, telephone (817) 222-5447, FAX (817) 222-5959.
Federal Register
Vol. 61, no. 208
Office of the Federal Register, National Archives and Records Administration
1996-10-25
continuing
daily
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357 p.
Table of Contents:
AE 2.7:
GS 4.107:
AE 2.106:
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https://www.govinfo.gov/app/details/FR-1996-10-25
P0b002ee180a2f153
0097-6326
0042-1219
0364-1406
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000582072
f:fr25oc96
https://www.govinfo.gov/app/details/FR-1996-10-25
https://www.govinfo.gov/content/pkg/FR-1996-10-25/pdf/FR-1996-10-25.pdf
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2010-09-24
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FR-1996-10-25
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