| AD Number | 58-13-05 | Status | Active |
| Effective Date | Not specified | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | N/A |
| Product Type | ["Engine"] | Product Subtype | Not specified |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Curtiss-Wright/Marquette, Inc. |
| Model(s) | Double Row Turbo Cyclone 972TC18DA1 (R-3350-34, -91) Double Row Turbo Cyclone 972TC18DA2 Double Row Turbo Cyclone 972TC18DA3 Double Row Turbo Cyclone 972TC18DA4 Double Row Turbo Cyclone 981TC18EA1 Double Row Turbo Cyclone 988TC18EA1 Double Row Turbo Cyclone 988TC18EA2 Double Row Turbo Cyclone 988TC18EA3 Double Row Turbo Cyclone 988TC18EA4 Double Row Turbo Cyclone 988TC18EA5 Double Row Turbo Cyclone 988TC18EA6 |
58-13-05 WRIGHT: Applies to All TC18DA and TC18EA Series Engines Except as Noted.
Compliance required as indicated.
To improve engine reliability, the following items must be accomplished:
1. At first overhaul after August 1, 1958, but no later than March 1, 1959, install either (a) piston compression ring, Wright Aeronautical Division P/N 147414 or subsequently approved ring in the No. 2 ring groove (WAD Service Bulletins Nos. TC18-269B or TC18E-81B covers this same subject), or (b) install steel, chrome-plated compression ring, Wright Aeronautical Division P/N 139619 or subsequently approved ring in the No. 2 ring groove. In connection with this piston ring, the cylinder barrel finish, piston ring fit, and crankcase oil manifold diverter valve configuration must be in accordance with the instructions contained in WAD Service Bulletins Nos. TC18-363 and TC18E-182.
2. At first overhaul after July 1, 1958, and each succeeding overhaul, install only new, resin graphite coated pistons in the master rod cylinders (1 and 2). In other locations, continued time pistons may be used provided they are recoated with either resin or spray graphite and are otherwise satisfactory for reuse. In addition, prior to reuse, the top and second grooves of all these pistons must be inspected for ring groove step wear and contouring of the ring groove wall. If any of these conditions are found, the piston must be regrooved. WAD Repair Instruction Nos. 860468 and 72-5-12 cover this same subject.
3. Applies to TC18EA Series engines only. At the next overhaul and each succeeding overhaul, the fuel injection pump timing and fuel injection line configuration must be in accordance with either Wright Aeronautical Service Bulletins Nos. TC18E-118 or TC18E-199.
4. At next overhaul but not later than March 1, 1959, the spark advance relays used in the ignition distributors on the subject engines must be assembled with increased relay spring pressures. Detailed instructions for setting the required spring pressure are contained in Scintilla Division Service Bulletin No. 408A.
5. At first overhaul after July 1, 1958, but not later than March 1, 1959, the valve springs used in all TC18 engines must have the coil ends contoured per WAD Service Bulletins Nos. TC18-339 or TC18E-159.
6. Superseded by AD 60-08-05.
7. To insure proper retention of the power recovery turbine wheel, the shaft and shaft nut threads must be inspected for wear and distortion at every power recovery turbine overhaul. WAD Service Bulletins Nos. TC18-327 and TC18E-146 detail the techniques and limits for such inspections. In addition, at first overhaul after September 1, 1958, but not later than March 1, 1959, the power recovery turbine must be assembled with WAD P/N 147555 nut or subsequently approved turbine wheel retaining system.
8. Superseded by AD 60-03-10.
9. To insure proper retention of the power recovery turbine nozzle, WAD P/N 492D21, nozzle tonozzle support attaching screws should be removed at next PRT overhaul and replaced with either WAD P/N 6043D8 or 492D65 screws. Until this is accomplished, a daily check of the tightness of the nozzle must be made in accordance with the instructions contained in WAD letter to all operators dated June 10, 1958.
10. At first overhaul after August 1, 1958, but not later than March 1, 1959, the rocker box drain manifold and sumps must be removed in accordance with WAD Service Bulletins Nos. TC18-347 or TC18E-166.