82-16-02 FOKKER B.V.: Amendment 39-4424. Applies to Model F28 Series 1000 and 4000 airplanes certificated in all categories, serial numbers as indicated below. Note: Some serial numbers listed may actually be 2000, 3000, 5000, or 6000 airplanes that are not presently eligible for U.S. certification. Those serial numbers may be disregarded insofar as this AD is concerned.
1. Unless already accomplished, accomplish the following within the time specified in each paragraph below after the effective date of this AD.
A. Applies to airplanes with serial numbers (S/N's) 11004 through 11016. Compliance required within the next 750 hours time in service. To prevent inadvertent cross connection of the engine fire extinguishing bottle electrical wiring, install placards and inspect and rework the wiring in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/26-2, Revision 1, dated March 19, 1970.
B. Applies to airplanes with S/N's 11003, 11004, 11006, and 11009 through 11012. Compliance required within the next 900 hours time in service. To preclude inadvertent fuel transfer, install a 1.0 p.s.i. check valve and rework the defueling control valve wiring in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/28-3 dated January 6, 1970.
C. Applies to airplanes with S/N's 11004 through 11016, 11021 through 11052, 11054 through 11061, 11063 through 11066, and 11991 through 11993. Compliance required within the next 100 hours time in service. To preclude fuel leakage, inspect fuel supply tubes for chafing damage, repair or replace such tubes as necessary, and provide adequate chafing protection in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/28- 8 dated December 24, 1969 (S/N's 11004 through 11016), or Service Bulletin F28/28-22, Revision 1, dated December 18, 1972 (S/N's 11021 through 11052, 11054 through 11061, 11063 through 11066, and 11991 through 11993).
D. Applies to airplanes with S/N's 11053, 11062, 11077, 11080, 11081, 11090 through 11093, 11108 through 11112, 11114 through 11116, 11118, 11120 through 11124, 11126 through 11128, 11130, 11133, 11135, 11138 through 11142, and 11144. Compliance required within the next 100 hours time in service. To preclude a fuselage fire, perform both of the following:
(1) Inspect the APU fuel supply line for interference with electrical wiring and replace as necessary; and
(2) Modify the fuel supply line installation and electrical wiring to provide adequate clearance in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/28-32, Revision 1, dated September 3, 1979.
E. Applies to all airplanes having check valve Part No. 123312-2-1 installed in the Auxiliary Power Unit (APU) bleed air duct. Compliance required within the next 100 hours time in service and at no greater than 3000 hour intervals time in service thereafter. To preclude damage to the APU, inspect the check valve for wear and replace, as necessary, in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/36-9, Revision 1, dated February 16, 1973.
F. Applies to airplanes with S/N's 11003 through 11056 and 11991 through 11993. Compliance required within the next 100 hours time in service. To ensure proper functioning of the fire seal, inspect the seventh stage bleed air duct fire seal and modify, as necessary, in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/36- 10 dated February 12, 1973.
G. Applies to airplanes with S/N's 11003 through 11101, and 11991 through 11993. Initial compliance required within the next 100 hours time in service and on a daily basis thereafter. To detect failure of the APU extension silencer and thereby preclude failure of APU exhaust jet pipe, inspect the extension silencer in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/49-24 dated February 23, 1976. These inspections may be discontinued upon installation of an improved APU extension silencer in accordance with Fokker Service Bulletin F28/49-21, Revision 1, dated May 10, 1976.
H. Applies to airplanes with S/N's 11003 through 11131, and 11991 through 11993. Compliance required within the next 1500 hours time in service. To ensure adequate drainage of fuel leakage from the APU compartment, modify the APU enclosure drain system in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/49-25 dated July 18, 1977.
I. Applies to airplanes with S/N's 11003 through 11013. Compliance required within the next 750 hours time in service. To maintain the integrity of the firewall, close the unused holes in the left hand and right hand engine nacelle firewalls in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/54-2, Revision 1, dated June 15, 1970.
J. Applies to airplanes with S/N's 11003 through 11073, 11075, and 11991 through 11993. Compliance required within the next 150 hours time in service. To prevent control cable failure due to corrosion, inspect, replace as necessary, and treat HPC and RPM control cables in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/76-16, Revision 1, dated October 6, 1975.
K. Applies to airplanes with S/N's 11003 through 11124, 11126 through 11132, 11134, 11991, and 11992. Compliance required within the next 100 hours time in service. To preclude inadvertent closure of the fire shutoff valves, inspect and correct microswitch adjustment, as necessary, and install seal wire (safety wire) on fire switch guards in accordance with the Accomplishment Instructions of Fokker Service Bulletin F28/76-20 dated January 1, 1979.
2. Alternate means of compliance with this AD which provide an equivalent level of safety may be used when approved by the Chief, Seattle Area Aircraft Certification Office, FAA Northwest Mountain Region.
3. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD.
The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1).
This amendment becomes effective August 30, 1982.