Airworthiness directives › 2012-06-14
AD 2012-06-14 Airworthiness Directives; Pratt & Whitney (PW)Turbofan Engines
Applicability*9
This AD applies to Pratt & Whitney JT9D-7R4G2 and -7R4H1 turbofan engines.
Compliance
Remove HPT 1st stage air seals, P/N 735907, from service as follows: (1) For air seals that have fewer than 6,500 CSN on the effective date of this AD, remove the air seals from service before exceeding 9,000 CSN. (2) For air seals that have 6,500 CSN or more on the effective date of this AD, do the following: (i) If the engine has a shop visit before the air seal exceeds 9,000 CSN, remove the air seal from service before exceeding 9,000 CSN. (ii) If the engine does not have a shop visit before the air seal exceeds 9,000 CSN, remove the air seal from service at the next shop visit, not to exceed 2,500 cycles from the effective date of this AD or 15,000 CSN, whichever occurs first.
Required actions
(1) After the effective date of this AD, do not install or reinstall into any engine any HPT 1st stage air seal, P/N 735907, removed from service in accordance with paragraph (f) of this AD. (2) After the effective date of this AD, do not install or reinstall into any JT9D-7R4G2 or JT9D-7R4H1 engine any HPT 1st stage air seal, P/N 735907, that exceeds the new life limit of 9,000 CSN.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done.
Affected ADs
None.
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