Airworthiness Directive · Amendment 39-17086 · Fuel
Fokker Services B.V. Airplanes
(1) This AD applies to Fokker Services B.V. Model F.28 Mark 0070 and 0100 airplanes, certificated in any category, all serial numbers.
(2) This AD requires revisions to certain operator maintenance documents to include new actions (e.g., inspections) and/or critical design configuration control limitations (CDCCLs). Compliance with these actions and/or CDCCLs is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by this AD, the operator may not be able to accomplish the actions described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance according to paragraph (j)(1) of this AD. The request should include a description of changes to the required actions that will ensure the continued operational safety of the airplane.
We are adopting a new airworthiness directive (AD) for all Fokker Services B.V. Model F.28 Mark 0070 and 0100 airplanes. This AD was prompted by a design review which revealed the absence of electrical insulation material between a wing or integral center wing tank (ICWT) fuel quantity indication system (FQIS) probe and the bottom of the tank structure. This AD requires for all airplanes, applying sealant below the FQIS probes in the wing tanks; and for certain airplanes, applying sealant below the FQIS probes in the ICWT. This AD also requires revising the aircraft maintenance program by revising the fuel airworthiness limitations and incorporating critical design configuration control limitations (CDCCLs). We are issuing this AD to prevent an ignition source in the tank vapor space, which could result in a fuel tank explosion and consequent loss of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Do the actions specified in paragraphs (g)(1) and (g)(2) of this AD, as applicable.
(1) For all airplanes: At a scheduled opening of the fuel tanks, but not later than 84 months after the effective date of this AD, apply sealant below the probes in the wing tanks, in accordance with Part 1 of the Accomplishment Instructions of Fokker Service Bulletin SBF100-28-067, dated September 2, 2011, including Fokker Manual Change Notification—Maintenance Documentation MCNM-F100-144, dated September 2, 2011.
(2) For airplanes having serial numbers 11442 through 11585 inclusive, and equipped with an ICWT: At a scheduled opening of the fuel tanks, but not later than 84 months after the effective date of this AD, apply sealant below the probes in the ICWT, in accordance with Part 2 of the Accomplishment Instructions of Fokker Service Bulletin SBF100-28-067, dated September 2, 2011, including Fokker Manual Change Notification—Maintenance Documentation MCNM-F100-144, dated September 2, 2011.
Before further flight after doing any action required by paragraph (g) of this AD, revise the aircraft maintenance program by incorporating the fuel airworthiness limitation and the CDCCL specified in paragraph 1.L.(1)(c) of Fokker Service Bulletin SBF100-28-067, dated September 2, 2011, including Fokker Manual Change Notification—Maintenance Documentation MCNM-F100-144, dated September 2, 2011.
After accomplishing the revision required by paragraph (h) of this AD, no alternative actions (e.g., inspections), intervals, or CDCCLs may be used unless the actions, intervals, or CDCCLs are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (j)(1) of this AD.
