AD/LTS/11 - Engine Electronic Overspeed Protection System (Cth)

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES

AlliedSignal (Lycoming) Turbine Engines - LTS 101 Series

AD/LTS/11 Engine Electronic Overspeed Protection System 8/95

DM

Applicability: AlliedSignal (formerly Textron Lycoming) model LTS101-650B1, -750B1, - 650C3/3A and -750C1 engines incorporating engine electronic overspeed protection systems installed during production prior to 9 May 1995, or retrofitted in accordance with either of the following Textron Lycoming Service Bulletins (SB) or their previous revisions:

LTS101B-73-10-0127 Revision 2 dated 14 August 1992, and

LTS101C-73-10-0129 Revision 3 dated 14 August 1992.

Note: These engines are known to be installed on but not limited to Messerschmitt- Bolkow-Blohm BK117 series and Bell Helicopter Textron 222 series helicopters.

Requirement: 1. Either replace the magnetic speed pickup, part number (PN) 4-301-356-01 in the engine electronic overspeed protection system with a serviceable speed pickup, in accordance with AlliedSignal Engines SB LTS101-73-10-0169 dated 12 December 1994, or inspect the magnetic speed pickup to determine the correct polarity in accordance with the same SB.

2. If, as a result of the Requirement 1 inspection, the magnetic speed pickup is determined to have the incorrect polarity, replace the pickup with a serviceable speed pickup in accordance with AlliedSignal Engines SB LTS101-73-10-0169 dated 12 December 1994.

3. Inspect uninstalled magnetic speed pickups PN 4-301-356-01 in accordance with AlliedSignal Engines SB LTS101-73-10-0169 dated 12 December 1994.

Note: FAA AD 95-08-14 Amdt 39-9203 refers.

Compliance: 1. If not previously accomplished, then within 100 hours time in service from 9 June 1995.