PRATT & WHITNEY CANADA MAINTENANCE MANUAL MANUAL PART NO AIRWORTHINESS LIMITATIONS

Transcription

1 LMTATONS 1. General The Airworthiness Limitations section specifies mandatory Rotor Component Cyclic Life Limits and mandatory Scheduled nspection/maintenance ntervals required for type certification. The Airworthiness Limitations section is approved by Transport Canada. 2. Rotor Component Cyclic Life Limits A. General (1) The engine rotating components listed in Table 1 are subject to low-cycle fatigue (LCF) due to cyclic operation of the engine. As a result, these parts must be replaced when the cycle limit is reached. (2) Operators shall record all flights, starts and accumulated total cycles (which must be calculated) in the applicable document for each component. NOTE: For the purpose of LCF life cycle calculation, a start is defined as an engine start followed by one or more flights. A flight is defined as a lift-off to touch down, irrespective of engine starts and stops. (3) Rotor components must be removed from service when the "total cycle limit" is reached. Service life is calculated in accordance with the following formula: Accumulated = [ No. of + ( No. of Flights - No. of Starts } ] X Fli ht Count Starts Abbreviated Cycle g (4) The service life values listed in Table 1 are incorporated in the Type Approval as issued by the Canadian Department of Transport. Changes to rotor component cyclic lives must be approved by Transport Canada. (5) The specified cyclic lives apply to engines, modules and components which contain parts listed in the approved parts list, as shown in the applicable llustrated Parts Catalog (PC) and Service Bulletins (SB). Operators requesting approval to incorporate parts not listed in the applicable PC or SB's will be required to substantiate the cyclic lives of these parts to their local airworthiness authority. (6) Operators making use of the APR setting to augment normal take-off must use the APR flight count factor each time the setting is used, as defined in Table 1. APR usage for one engine inoperative mode or when required for system testing in accordance with the airframe manufacturers recommendations allows the use of the normal take-off flight count factor. NOTE: Scheduled use of the APR rating during take-off increases the flight count factor. (7) Operators which have scheduled in-flight shut-downs and re-lights such as in-training missions must define the engine re-lights as engine starts per equation in step (3). Page 1 J~n 18/9~

2 B. Service Life Marking Method (1) At overhaul or major refurbishment all rotor components must be marked in accordance with the applicable Overhaul Manual, using the following codes: {a) Total cycles must be marked using a CY prefix, as follows: 1 The total cycles accumulated between each shop visit, rounded to the nearest 100 cycles, must be marked with the last two digits dropped and followed by a dash (-). 2 Example: A part having cycles between visits of 525, 1819 and 1972 cycles would be marked as CY which equals approximately 4300 total cycles. TABLE 1, Rotor Components - Service Life Part No. Model T.O. T.O. Hub-Fan PW305, PW305, SB mpeller PW305, PW305, S PW305, S PW305, S ~-; ~ tllc/ pw305, S PW305, S Page 2

3 Rotor - High Compressor HQC.. (1st-stage) (2nd-, 3rdand 4th-stage) / Part No. Model T.O. T.O PW305, PW305, "1 111 ~ PW305, Jt PW305, PW305, PW305, PW305, PW305, PW305, PW305, PW305, Page 3

4 Part No. Model T.0. T.O PW305, SB PW305, SB PW305, SB PW305, SB PW305, SB PW305, S PW305, PW305, PW305, PW305, PW305, PW305, SB24295 qooo Page 4

5 PRAT & WHTNEY CANADA._, Disk - Turbine (1st-stage).ti L (2nd-stage) (3rd-stage) (4th-stage) µ~r L~ T L () Part No. Model T.O. T.O PW305, PW305, PW305, PW305, i:Q.:1) PW c 1"3" ~ PW305, SB A1102 PW305, A A1457 PW305, PW305A 30A A1499 PW305, PW305A 30A ,. l Page 5

6 Part No. Model T.O. T.O. 30A1565 PW305, A SB24454 (5th-stage) LOT Cover, HP Turbine, Rotor, Front 30A1104 PW305, A PW PW305, " SB Cover, HP Turbine, Rear PW PW305, V3' : D ~?.ll.11.2!> Seal -Air, HP Turbine Rotor PW305, PW305, PW305, PW305, SB24272 Page 6

7 .. PRATT & WHTNEY CANADA Part No. Model T.O. T.O PW305, PW305, Page 7/8