Airworthiness Directive · Amendment 39-17360 · Pitot/static anti-ice system
Cessna Aircraft Company Airplanes
This AD applies to The Cessna Aircraft Company Model 750 airplanes, certificated in any category, serial numbers 0001 through 0245 inclusive.
We are adopting a new airworthiness directive (AD) for certain Cessna Aircraft Company Model 750 airplanes. This AD was prompted by reports of loss of displayed airspeed. This AD requires inspecting certain logic modules to determine if certain cabin altitude/pitot static heater module assemblies are installed and replacing those assemblies with a new assembly; and revising the Non-Normal Procedures Section of the airplane flight manual (AFM) to include procedures for resetting the pitot switch in the event of pitot heater failure and for total loss of airspeed indication. We are issuing this AD to prevent the loss of all displayed airspeed, which could result in reduced ability to control the airplane.
Within 600 flight hours or one year after the effective date of this AD, whichever occurs first: Do an inspection of logic modules NC006 and NC007 to determine if any cabin altitude/pitot static heater module assemblies having part number (P/N) 6718477-9, P/N 6718477-10, or P/N 9914731-1 are installed, in accordance with the Accomplishment Instructions of Cessna Service Letter SL750-30-08, Revision 1, dated July 11, 2011. If any altitude/pitot static heater module assembly having P/N 6718477-9, P/N 6718477-10, or P/N 9914731-1 is installed: Before further flight, replace that assembly with a new assembly having P/N 6718477-11, in accordance with the Accomplishment Instructions of Cessna Service Letter SL750-30-08, Revision 1, dated July 11, 2011.
Concurrently with the actions required by paragraph (g) of this AD: Revise the Non-Normal Procedures Section of the Cessna 750 AFM to include the information in the flight manual changes identified in paragraphs (h)(1), (h)(2), (h)(3), (h)(4), (h)(5), and (h)(6) of this AD. This may be done by inserting copies of these flight manual changes into the Cessna 750 AFM. When these flight manual changes have been included in general revisions of the AFM, the general revisions may be inserted in the AFM, provided the relevant information in the general revision is identical to that in these flight manual changes, and then these temporary flight manual changes may be removed.
(1) Cessna Temporary FAA Approved Airplane Flight Manual Change 75FM TC-R11-23, approved June 26, 2012.
(2) Cessna Temporary FAA Approved Airplane Flight Manual Change 75FM TC-R11-24, approved June 26, 2012.
(3) Cessna Temporary FAA Approved Airplane Flight Manual Change 75FM TC-R11-25, approved June 26, 2012.
(4) Cessna Temporary FAA Approved Airplane Flight Manual Change 75FM TC-R11-26, approved June 26, 2012.
(5) Cessna Temporary FAA Approved Airplane Flight Manual Change 75FMA TC-R02-03, approved April 10, 2012.
(6) Cessna Temporary FAA Approved Airplane Flight Manual Change 75FMA TC-R02-07, approved June 26, 2012.
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.
Aircraft
