AD 84-18-05

84-18-05 FOKKER VFW B.V.: Amendment 39-4911. Applies to all Model F27 Series airplanes, serial numbers 10102 to 10611, inclusive, that are equipped with pylon tanks and the maximum certificated takeoff weight is above 41,000 pounds, certificated in all categories. Compliance is required as indicated, unless already accomplished. To prevent wing structural failure, accomplish one of the following (A, B, or C):

A. Within the next 100 hours time in service after the effective date of this airworthiness directive (AD):

1. Remove the existing airspeed limitation placards and install new placards in accordance with paragraph 2.A and 2.B of the Accomplishment Instructions of Fokker Service Bulletin No. 11/3 dated October 1, 1981.

2. Incorporate changes to the FAA approved Airplane Flight Manual in accordance with paragraphs 1.C and 3 of Fokker Service Bulletin No. 11/3 dated October 1, 1981.

3. Modify the airspeed indicators and overspeed aural warning system to provide a switchable maximum operating speed (VMO) that allows selecting a VMO of 204 knots I.A.S. for operation when the maximum takeoff weight exceeds 41,000 pounds, in a manner approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region.

B. Within the next 100 hours time in service after the effective date of this AD, modify as follows:

1. Revise the redline marking of the airspeed indicator or replace the airspeed indicator to reflect the new maximum airspeed limitation of 204 knots I.A.S.

2. Post a placard on the left and right hand instrument panel to read as follows: "MAXIMUM AIRSPEED, 204 KIAS."

3. Adjust the overspeed aural warning device or install a new device so as to comply with the new maximum airspeed limitation; i.e., 204 knots I.A.S., within the tolerances specified by FAR 25.1303(c)(1).

C. Apply for and obtain a supplement to the Airplane Flight Manual which will provide for an operating limitation of 41,000 pounds takeoff weight. Applications may be made to the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region.

D. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region.

E. 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 modifications required by this AD.

This amendment becomes effective October 15, 1984.