Airworthiness directives › 2012-06-18
AD 2012-06-18 Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
Applicability*9
This AD applies to all Pratt & Whitney PW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4160, PW4460, PW4462, and PW4650 turbofan engines, including models with any dash number suffix, that have not incorporated Pratt & Whitney Alert Service Bulletin (ASB) No. PW4ENG-A72-436; Service Bulletin (SB) No. PW4ENG-79-76; and SB No. PW4ENG-72-472.
Compliance
(1) Within 1,000 cycles-in-service (CIS) after the effective date of this AD, inspect and clean the No. 4 bearing compartment. (2) Thereafter, within every additional 1,000 CIS, re-inspect and clean the No. 4 bearing compartment.
Required actions
At the next engine shop visit, but not to exceed 5 years after the effective date of this AD, do the following: (1) Replace the No. 4 bearing packing transfer tube assembly; (2) Replace the No. 4 bearing internal scavenge tube assembly; (3) Remove the No. 4 bearing shield, and the No. 4 bearing shield option; and (4) Install the new No. 4 bearing shield options. (5) Modify the turbine exhaust case to relocate the No. 4 bearing pressure and scavenge tube ports to below the engine centerline; (6) Replace the internal No. 4 bearing pressure and scavenge tubes; (7) Modify or replace the turbine case cooling brackets to support the new No. 4 bearing pressure and scavenge tubes; (8) Replace the turbine case manifolds as necessary; and (9) Install the new brackets and clamps to support the new routing configuration.
Unsafe condition
(1) If you have incorporated Pratt & Whitney ASB No. PW4ENG-A72-436; SB No. PW4ENG-79-76; and SB No. PW4ENG-72-472, then no further action is required. (2) Comply with this AD within the compliance times specified, unless already done.
Affected ADs
None.
Read the original on the Federal Register →
You just looked this one up by hand
TrackAD holds all 12,278 of them and matches them against the aircraft you actually look after — airframe, engine, propeller and appliances in one pass — then works out what falls due and when.
- Bring your existing list in from a spreadsheet Paste the rows straight out of Excel. Headers like C/W Date and N/A are read for you.
- A copy that works when this does not One file. No internet, no login, no this software running. For the morning something has to be produced and the computer is not cooperating.
- $5 a month, or $50 a year Up to 50 aircraft on either.
Look round a real shop first Start free
The demonstration shop is eleven real aircraft with a year of work behind them. No account needed.
The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1