Airworthiness Directive · Amendment 39-15271 · Rolls-Royce Corporation AE 3007A and AE 3007C Series Turbofan Engines

AD 2007-24-05

Rolls-Royce Corporation AE 3007A and AE 3007C Series Turbofan Engines

Engine

Published: November 28, 2007
Effective: January 2, 2008
Maker: Rolls-Royce Corporation (Formerly Allison Engine Company, Inc.)
Supersedes: 99-02-51

Applies to

This AD applies to Rolls-Royce Corporation (RRC) (formerly Allison Engine Company, Inc.) AE 3007A and AE 3007C series turbofan engines. These engines are installed on, but not limited to, Cessna Aircraft Company 750 series, and Empresa Brasileira de Aeronautica S. A. (EMBRAER) EMB-135 and EMB-145 series airplanes.

The FAA's summary

The FAA is superseding an existing airworthiness directive (AD) for Rolls-Royce Corporation (RRC) AE 3007A and AE 3007C series turbofan engines. That AD currently prohibits any flight following a ground engine start where the engine oil temperature is below 32 [deg]F (0 [deg]C), unless certain preflight operational procedures are followed. This AD also requires those actions and would also require a terminating action. This AD results from design improvements to components in the accessory gearbox air turbine starter mounting pad. We are issuing this AD to prevent an in-flight engine shutdown due to loss of engine oil from the engine accessory gearbox starter pad shaft seal drain and possible loss of the airplane.

What it requires

Compliance

You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.

Prohibited Flights

All flights after ground engine starts at engine oil temperatures below 32 °F (0 °C), are prohibited except as follows:

(1) If the engine oil temperature has dropped below 32 °F (0 °C), before flight, perform a high-power leak check on each engine (at least three minutes at takeoff power).

(2) Oil consumption greater than 0.32 quart per hour, or 300 cc per hour, is not permitted. Instructions for performing the high-power leak check for the AE 3007A series engines can be found in the Rolls-Royce AE 3007A Series Maintenance Manual, TASK 72-00-00-700-801, SUBTASK 72-00-00-790-002. Leak check limits for the AE 3007A series engines can be found in the Rolls-Royce AE 3007A Series Maintenance Manual, TASK 71-00-00-200-801.

(3) Instructions for performing the high-power leak check for the AE 3007C series engines (including leak check limits) can be found in the Rolls-Royce AE 3007C Series Maintenance Manual, TASK 72-00-00-700-801, SUBTASK 72-00-00-790-002.

Terminating Action

No later than September 30, 2009, as terminating action to the requirements in paragraph (f) through (f)(3) of this AD, do the following, as applicable to your engine configuration:

(1) Remove seal and related component, part numbers (P/Ns) 42520-71, 42520-196-X, 99004-1-6, 42520-75, or 42520-167, from the accessory gearbox (AGB) air turbine starter mounting pad.

(2) Install a new O-ring, P/N AS3209-026, M83248/1-026 or other serviceable part, to the shaft of the starter mounting pad.

(3) Install a new bearing locknut, P/N 42520-170, or other serviceable part, and an AGB air turbine starter mounting pad mechanical seal, P/N 42520-192, or other serviceable part.

(4) Use paragraphs 2. through 2.G. of the Accomplishment Instructions of RRC Service Bulletin (SB) No. AE 3007A-72-321/AE 3007C-72-250, Revision 2, dated November 12, 2007, to do the removals and installations.

(5) For AE 3007A series engines, remove the drain cap or starter drain adapter. Use paragraphs 2. through 2.C.(4)(c) of the Accomplishment Instructions of RRC SB No. AE 3007A-72-274, Revision 1, dated November 12, 2007 to do the removal.

(6) For AE 3007A series engines, install an open starter drain adapter. Use paragraphs 2. through 2.C.(2) of the Accomplishment Instructions of RRC SB No. AE 3007A-72-330, Revision 1, dated November 12, 2007 to do the installation.

(7) For AE 3007C series engines, install an open starter drain adapter. Use paragraphs 2. through 2.E.(2) of the Accomplishment Instructions of RRC SB No. AE 3007C-72-223, Revision 1, dated November 12, 2007 to do the installation.

Definition

A serviceable part is any FAA-approved part not being removed from service, or not otherwise specifically addressed by this AD action.

Prohibition of Seals

(i) Do not install seal and related component P/Ns 42520-71, 42520-196-X, 99004-1-6, 42520-75, and 42520-167, on the air starter mounting pad after the terminating action in this AD is performed.

Previous Credit

Previous credit is allowed for the terminating action in paragraphs (g)(1) through (g)(7) of this AD, that was done before the effective date of this AD using the Accomplishment Instructions of the SBs listed in the following Table 1:

Table 1.—SBs Allowing Previous Credit


For AE 3007A Series Engines:
(1) Engine—Accessory Drive Gearbox Assembly—New Starter Shaft Seal; RRC SB No. AE 3007A-72-321/AE 3007C-72-250, Revision 1, dated November 7, 2005; and
(2) Engine—Accessory Gearbox Starter Pad Drain—Remove The Drain Cap or Starter Drain Adapter; RRC SB No. AE 3007A-72-274, dated January 19, 2006; and
(3) Engine—Accessory Gearbox Starter Pad Drain—Install the Open Starter Drain Adapter (23083402 or 23077526); RRC SB No. AE 3007A-72-330, dated January 19, 2006.
For AE 3007C Series Engines:
(4) Engine—Accessory Drive Gearbox Assembly—New Starter Shaft Seal; RRC SB No. AE 3007A-72-321/AE 3007C-72-250, Revision 1, dated November 7, 2005; and
(5) Engine—Accessory Gearbox Starter Pad Drain—Install the Open Starter Drain Adapter (23077526 or 23083403); RRC SB No. AE 3007C-72-223, dated January 19, 2006.

Official sources

The Federal Register document · document E7-22810, the legal text
FAA Dynamic Regulatory System (DRS) · search 2007-24-05 for its current status and any corrections

For AE 3007A Series Engines:

(1) Engine—Accessory Drive Gearbox Assembly—New Starter Shaft Seal; RRC SB No. AE 3007A-72-321/AE 3007C-72-250, Revision 1, dated November 7, 2005; and

(2) Engine—Accessory Gearbox Starter Pad Drain—Remove The Drain Cap or Starter Drain Adapter; RRC SB No. AE 3007A-72-274, dated January 19, 2006; and

(3) Engine—Accessory Gearbox Starter Pad Drain—Install the Open Starter Drain Adapter (23083402 or 23077526); RRC SB No. AE 3007A-72-330, dated January 19, 2006.

For AE 3007C Series Engines:

(4) Engine—Accessory Drive Gearbox Assembly—New Starter Shaft Seal; RRC SB No. AE 3007A-72-321/AE 3007C-72-250, Revision 1, dated November 7, 2005; and

(5) Engine—Accessory Gearbox Starter Pad Drain—Install the Open Starter Drain Adapter (23077526 or 23083403); RRC SB No. AE 3007C-72-223, dated January 19, 2006.