Series 100 and 200; Defective Fuel Hoses

Series 100 and 200; Defective Fuel Hoses

Extracted From:    AC No. 43-16A
    ALERT NO. 307
    February 2004

Cessna; Series 100 and 200; Defective Fuel Hoses (P/N S1495-6); ATA 2820

The Airframe and Propulsion and Services Wichita Aircraft Certification Office, ACE-118W, located in Wichita, Kansas, submitted the following article. (This article is published as it was received.)

Recently the FAA was advised that a current production Cessna single engine airplane experienced a fuel leak at the flexible fuel line connection between the wing fuel tank and the fuselage fuel line connection. The suspect hose is identified in the applicable airplane parts manual as S1495-6, which Cessna has used for many years on all single engine airplane products. Cessna has confirmed that two of their fuel hose suppliers provided hose material to the Cessna Aircraft Co. on 5/13/99 and 12/2/99 that may not meet their specification S1495. Therefore, the FAA recommends that owners, operators and inspection personnel of Cessna single engine airplanes that may have had a new Cessna Specification S1495-6 fuel hose installed that was obtained/shipped from Cessna Parts Distribution between May 1999 and November 2000 inspect the hoses for rapid age wear. This inspection is recommended to apply to new airplanes with Airworthiness Certificates dated from May 1999 through June 2000 as well as those that have field installed hoses that may have been shipped from Cessna Parts Distribution between May 1999 and November 2000.

If any of the S1495-6 hose connections have identification markings that indicate Dayco series 7095, any Boston identification, or any identification other than Dayco L3 or B7, remove all S1495-6 hose connections in the LH and RH wingroot and replace with new S1495-6 hose having Dayco B706 identification markings. Dayco 6L3 was an approved hose as well, but is no longer utilized under the S1495 specification.

If identification markings are unreadable or not present, inspect all S1495-6 hose connections in the LH and RH wing root areas for evidence of hardening, as described below. If any S1495-6 hose connections exhibit evidence of hardening, remove all of the hose connections in the LH and RH wing root areas and replace with new S1495-6 hose having Dayco B706 identification markings.

Hardening can be determined by pinching the hose between one’s thumb and forefinger. Hoses that do not compress or are not resilient can be considered hardened and should be replaced.

The FAA may publish additional advisory and possibly regulatory information applicable to the Cessna S1495 hose installation depending on the results of a current field survey. However, it has been determined that enough time has elapsed since the suspect hoses were shipped from Cessna that routine maintenance might have already encouraged the replacement of some suspect hoses either in the fleet or available from spares support facilities in the field. Therefore, the FAA is publishing this Alerts Article to advise owners, operators, and repair facilities that any remaining S1495 hose shipped from Cessna between May 1999 and November 2000 and possibly installed should be removed from service and any remaining inventory not identified as Dayco B706 should be removed from spares inventory.

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