Airworthiness Directive · Amendment 39-16472 · Landing gear
Fokker Services B.V. Model F.28 Mark 0070 and 0100 Airplanes
This AD applies to Fokker Services B.V. Model F.28 Mark 0070 and 0100 airplanes, certificated in any category, all serial numbers, with any brake quick-disconnect (QD) coupling having part number (P/N) AE70690E, AE70691E, AE99111E, or AE99119E installed.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated 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: * * * * * Recently, a brake fire was reported which was caused by a ruptured brake piston. The fire was quickly extinguished but caused damage to the paint and hydraulic/electrical harness and its components. Detailed investigation showed that a hydraulic lock must have been present close to the affected brake creating enough internal pressure to rupture the piston. The most probable scenario for the hydraulic lock is a loosened (not necessarily disconnected) brake QD [quick-disconnect] coupling. Further investigation of the service experience files at Fokker Services showed that more brake fires have occurred on aeroplanes in a pre-mod SBF100-32-127 configuration. * * * * * The unsafe condition is loss of braking capability and possible brake fires, which could reduce the ability of the flightcrew to safely land the airplane. We are issuing this AD to require actions to correct the unsafe condition on these products.
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 following actions.
(1) Within 6 months after the effective date of this AD, do a detailed inspection for wear of the brake QD couplings by measuring dimension “A,” in accordance with Part 1 of the Accomplishment Instructions of Fokker Service Bulletin SBF100-32-156, Revision 1, dated June 29, 2009. Repeat the inspection thereafter at the applicable intervals specified in Table 1 of this AD, except as required by paragraph (g)(2) of this AD.
| If dimension “A” is— | Repeat the inspection at intervals not to exceed— |
|---|---|
| Greater than or equal to 0.76 mm | 6 months. |
| Less than 0.76 mm but greater than or equal to 0.72 mm | 3 months. |
| Less than 0.72 mm but greater than or equal to 0.68 mm | 30 days. |
| Less than 0.68 mm but greater than or equal to 0.61 mm | 7 days. |
| Less than 0.61 mm but greater than 0.53 mm | 24 hours. |
(2) If, during any inspection required by paragraph (g)(1) of this AD, dimension “A” on any brake QD coupling is less than or equal to 0.53 mm, before further flight, replace the affected brake QD coupling with an improved unit having P/N AE73059E or P/N AE73091E, as applicable, in accordance with Part 2 of the Accomplishment Instructions of Fokker Service Bulletin SBF100-32-156, Revision 1, dated June 29, 2009.
(3) Within 24 months after the effective date of this AD, replace all remaining brake QD couplings having P/N AE70690E, P/N AE70691E, P/N AE99111E, and P/N AE99119E with improved units, in accordance with Part 2 of the Accomplishment Instructions of Fokker Service Bulletin SBF100-32-156, Revision 1, dated June 29, 2009.
(4) Installation of brake QD couplings with an improved unit having P/N AE73059E or P/N AE73091E at all locations terminates the repetitive inspections required by paragraph (g)(1) of this AD.
(5) Replacing the brake QD couplings is also acceptable for compliance with the corresponding requirements of paragraphs (g)(1), (g)(2), and (g)(3) of this AD if done before the effective date of this AD, in accordance with any of the service bulletins specified in Table 2 of this AD:
| Fokker Service Bulletins | Revision | Date |
|---|---|---|
| Fokker Performa Service Bulletin SBF100-32-127, including Appendix XIV, dated February 1, 2006 | Original | July 20, 2001. |
| Fokker Performa Service Bulletin SBF100-32-127, including Appendix XIV, dated February 1, 2006 | 1 | March 6, 2009. |
| Fokker Service Bulletin SBF100-32-156 | Original | March 6, 2009. |
Note 1: This AD differs from the MCAI and/or service information as follows: No differences.
