Airworthiness Directive · Amendment 39-16422 · Pratt & Whitney Canada (P&WC) PW530A, PW545A, and PW545B Turbofan Engines
Pratt & Whitney Canada (P&WC) PW530A, PW545A, and PW545B Turbofan Engines
This AD applies to Pratt & Whitney Canada (P&WC) PW530A, PW545A, and PW545B turbofan engines that incorporate either P&WC Service Bulletin (SB) PW500-72-30343 or PW500-72-30404. These engines are installed on, but not limited to, Cessna Aircraft Company model 550 (Citation Bravo) and model 560 (Citation Excel and XLS) airplanes.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, do the following actions.
(1) For engines that have an intercompressor bleed valve (BOV) servo valve with 250 or more hours time-in-service (TIS) since new or overhaul on the effective date of this AD, no further action is required.
(2) For engines that have a BOV servo valve with fewer than 50 hours TIS since new or overhaul on the effective date of this AD, remove the BOV servo valve from service as specified in Table 1 of this AD.
| Engine model | Remove from service... |
|---|---|
| PW530A and PW545A | Within 15 hours TIS after the effective date of this AD. |
| PW545B engines before incorporation of SB PW500-72-30311 | Within 15 hours TIS after the effective date of this AD. |
| PW545B engines after incorporation of SB PW500-72-30311 | Within 35 hours TIS after the effective date of this AD. |
(3) For engines that have a BOV servo valve with 50 hours or more TIS and fewer than 250 hours TIS since new or overhaul on the effective date of this AD, test the engine as specified in P&WC Alert Service Bulletin (ASB) PW500-72-A30421, dated June 29, 2010. Use the compliance times specified in Table 2 of this AD.
| Engine model | Perform test... |
|---|---|
| PW530A and PW545A | Within 15 hours TIS after the effective date of this AD. |
| PW545B engines before incorporation of SB PW500-72-30311 | Within 15 hours TIS after the effective date of this AD. |
| PW545B engines after incorporation of SB PW500-72-30311 | Within 35 hours TIS after the effective date of this AD. |
(4) Thereafter, test the engine as specified in P&WC ASB PW500-72-A30421, dated June 29, 2010. Use the compliance times specified in Table 3 of this AD.
| Time on BOV servo valve | Repeat test |
|---|---|
| Fewer than 100 hours TIS since new | Within 25 hours TIS since last inspection. |
| 100 or more hours TIS since new, but fewer than 250 hours TIS since new | Within 50 hours TIS since last inspection. |
| 250 or more hours TIS since new | No repetitive tests required. |
Replacing the BOV servo valve with a BOV servo valve that is not subject of this AD is terminating action to the testing requirements of paragraphs (e)(3) and (e)(4) of this AD.
This AD differs from the Mandatory Continuing Airworthiness Information (MCAI) in that while the MCAI requires initial mandatory action on only one engine per airplane with follow-on action to the second engine at a later compliance time, this AD requires initial action on both engines of the airplane at the same compliance time.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
