86-11-03 ROLLS-ROYCE LIMITED: Amendment 39-5301. Applies to Rolls-Royce Spey 555-15, -15H, - 15N, and -15P turbofan engines.
Compliance is required as indicated unless already accomplished.
To prevent possible failure of the stage 12 high pressure compressor (HPC) disk, stage 12 HPC rotor seal, and low pressure compressor (LPC) drive shaft (Pre-Mod. 4927), accomplish the following in accordance with Rolls-Royce Service Bulletin (SB) Sp 72-969, dated May 1984, or FAA approved equivalent:
Remove stage 12 HPC disks and rotor seals, and LPC drive shafts (Pre-Mod. 4927) from service on or before accumulating the cyclic lives (flights) specified below. Parts which have accumulated more cycles in service than those specified below on the effective date of this AD, must be removed prior to further flight.
CYCLIC LIVES
PART
DESCRIPTION
MODIFICATION
A*
NUMBER
OF FLIGHTS
B*
NUMBER
OF FLIGHTS
C*
NUMBER
OF FLIGHTS
D*
NUMBER
OF FLIGHTS
E*
NUMBEROF FLIGHTS
F*
NUMBER
OF FLIGHTS
High Pressure Compressor Stage 12 Rotor Disks and Seals
13,800
15,600
17,600
19,700
22,100
17,300
Low Pressure
Compressor
Rotor Drive Shaft
Pre-Mod
4927
10,800
10,800
11,500
12,600
14,400
11,200
*NOTE: Cyclic lives for each component are for flight profiles as denoted by A through F and defined below:
For engines with no N2 monitoring:
A. Spey 555-15 and 555-15N full throttle
Spey 555-15H and 555-15P rated takeoff
For engines with N2 monitoring:
B. Where 85 percent of takeoffs do not exceed 100 percent N2
C. Where 85 percent of takeoffs do not exceed 99 percent N2
D. Where 85 percent of takeoffs do not exceed 98 percent N2
E. Where 85 percent of takeoffs do not exceed 97 percent N2
F. Datum profile, average 99.5 percent N2
Aircraft may be ferried in accordance with the provisions of FAR Sections 21.197 and 21.199 to a base where the AD can be accomplished.Rolls-Royce SB Sp 72-969, dated May 1984, identified and described in part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received this document from the manufacturer may obtain copies upon request to the Service Manager, Spey Engine, Rolls-Royce Limited, East Kilbride, Glasgow G74-4PY, Scotland. This document also may be examined at the Office of the Regional Counsel, New England Region, Federal Aviation Administration, 12 New England Executive Park, Burlington, Massachusetts 01803, Room Number 311, between the hours of 8:00 a.m. and 4:30 p.m., Monday through Friday except Federal holidays.
This amendment becomes effective on June 20, 1986.