Airworthiness Directive · Amendment 39-15074 · Cessna Model 500, 501, 550, 551, S550, 560, 560XL, and 750 Airplanes
Cessna Model 500, 501, 550, 551, S550, 560, 560XL, and 750 Airplanes
This AD applies to Cessna Model 500, 501, 550, 551, S550, 560, 560XL, and 750 airplanes, certificated in any category; as identified in the service bulletins specified in Table 1 of this AD.
| Cessna Service Bulletin | Revision | Date | Cessna model |
|---|---|---|---|
| SB500-26-02, including Service Bulletin Supplemental Data, dated April 1, 2005 | 1 | July 7, 2005 | 500/501 airplanes. |
| SB500-26-02 | Original | April 1, 2005 | 500/501 airplanes. |
| SB550-26-05 | Original | April 1, 2005 | 550/551 airplanes. |
| SB560-26-01 | Original | April 1, 2005 | 560 airplanes. |
| SB560XL-26-02 | 1 | December 22, 2004 | 560XL airplanes. |
| SB750-26-05 | Original | November 24, 2004 | 750 airplanes. |
| SBS550-26-02 | Original | April 1, 2005 | S550 airplanes. |
The FAA is superseding an existing airworthiness directive (AD), which applies to certain Cessna Model 500, 550, S550, 560, 560XL, and 750 airplanes. That AD currently requires installing identification sleeves on the wires for the positive and negative terminal studs of the engine and/or auxiliary power unit (APU) fire extinguishing bottles, as applicable, and re-connecting the wires to the correct terminal studs. This new AD retains the requirements of the existing AD; adds airplanes to the applicability; and, for certain airplanes only, requires a review of wiring changes made using the original issue of one service bulletin and corrective actions if necessary. This AD results from a determination that additional airplanes are subject to the unsafe condition described in the existing AD. We are issuing this AD to ensure that the fire extinguishing bottles are activated in the event of an engine or APU fire, and that flammable fluids are not supplied during a fire, which could result in an unextinguished fire in the nacelle or APU.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
For Model 500, 550, S550, 560, 560XL, and 750 airplanes: Within 100 flight hours or 60 days after March 24, 2006 (the effective date of AD 2006-04-10), whichever occurs first, install identification sleeves on the wires for the positive and negative terminal studs of the applicable fire extinguishing bottles identified in paragraphs (f)(1), (f)(2), and (f)(3) of this AD; re-connect the wires to the correct studs; test the connection; and re-connect the wires again as applicable until the connection tests correctly. Do all actions in accordance with the Accomplishment Instructions of the applicable service bulletin identified in Table 1 of this AD; except that, for Model 500 airplanes, Cessna Service Bulletin SB500-26-02, Revision 1, dated July 7, 2005, may be used. After the effective date of this AD, only Cessna Service Bulletin SB500-26-02, Revision 1, may be used to accomplish the requirements of this paragraph for Model 500 airplanes.
(1) For Cessna Model 500, 550, S550, and 560 airplanes: The engine fire extinguishing bottles.
(2) For Cessna Model 560XL airplanes: The engine and the APU fire extinguishing bottles.
(3) For Cessna Model 750 airplanes: The APU fire extinguishing bottle.
For Model 560XL airplanes: Actions done before March 24, 2006, in accordance with the Accomplishment Instructions of Cessna Service Bulletin SB560XL-26-02, dated November 22, 2004, are acceptable for compliance with the corresponding actions in this AD.
For Model 501 and 551 airplanes: Within 100 flight hours or 60 days after the effective date of this AD, whichever occurs first, do the actions required by paragraph (f) of this AD for the engine fire extinguishing bottles in accordance with Cessna Service Bulletin SB500-26-02, Revision 1, dated July 7, 2005; or Cessna Service Bulletin SB550-26-05, dated April 1, 2005; as applicable.
(i) For Model 500 airplanes on which the actions specified in Cessna Service Bulletin SB500-26-02, dated April 1, 2005, have been done before the effective date of this AD: Within 100 flight hours or 60 days after the effective date of this AD, whichever occurs first, verify that wiring changes previously done in accordance with Cessna Service Bulletin SB500-26-02, dated April 1, 2005, conform to the changes described in Cessna Service Bulletin SB500-26-02, Revision 1, dated July 7, 2005; and, if any non-conforming wiring changes are discovered, before further flight, correct the wiring changes as applicable to conform to the changes described in Cessna Service Bulletin SB500-26-02, Revision 1, dated July 7, 2005.
Although the Accomplishment Instructions of the service bulletins identified in Table 1 of this AD describe procedures for submitting a maintenance transaction report to the manufacturer, this AD does not require that action.
At the applicable time specified in paragraph (k)(1) or (k)(2) of this AD, no person may install on any airplane a fire extinguishing bottle unless identification sleeves on the wires for the positive and negative terminal studs have been installed in accordance with paragraph (f) or (h) of this AD, as applicable.
(1) For Model 500, 550, S550, 560, 560XL, and 750 airplanes: After March 24, 2006.
(2) For Model 501 and 551 airplanes: After the effective date of this AD.
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.
