AD 90-25-15 ACTIVE

90-25-15 FOKKER: Amendment 39-6826. Docket No. 90-NM-247-AD.
Applicability: All Model F-28 Mark 0100 series airplanes, equipped with main wheel assemblies Part Nos. 5008131-2 and 5008131-3, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent wheel failure, reduced steering capability, loss of braking performance, structural damage and possible injury to people, accomplish the following:

A. Within 6 days after the effective date of this AD, and thereafter prior to each flight, perform a visual inspection of the main landing gear (MLG) wheel assemblies for missing or cracked tie bolts. If any bolt is broken or missing, prior to further flight, replace the wheel with a serviceable wheel.

B. Upon removal of any wheel in accordance with paragraph A. of this AD or for a tire change, accomplish the following:

1. After thorough cleaning, perform a magnetic particle inspection of all main wheel tie bolts for cracks.

a. If a bolt is cracked, prior to further flight replace the cracked bolt.

b. If a bolt is broken or missing, prior to further flight, replace the bolt and the two adjacent bolts (one on each side).

c. If more than one bolt is broken or missing, prior to further flight, replace all bolts.

2. Inspect all bolts and nuts for crossed threads, and the self-locking feature for a minimum torque of 18 inch-pounds (2.0 Nm). If defective parts are found, prior to further flight, replace all defective parts.

C. Within 60 days after the effective date of this AD, replace the MLG wheel assemblies, having Part Nos. 5008131-2 or 5008131-3, with modified wheel assemblies, Part Number 5008131-4, in accordance with Fokker Service Bulletin F100-32-044, dated October 24, 1990. Installation of the modified wheel assemblies constitutes terminating action for the repetitive inspections required by paragraphs A. and B. of this AD.

NOTE: The Fokker servicebulletin references Aircraft Braking System Corporation Service Bulletin Fo-100-32-24, dated June 30, 1990, for additional instructions.

D. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM- 113, FAA, Transport Airplane Directorate.

NOTE: The request should be submitted directly to the Manager, Standardization Branch, ANM- 113, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Manager, Standardization Branch, ANM-113.

E. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to Fokker Aircraft USA, Inc., 1199 N. Fairfax Street, Alexandria, Virginia 22314 or Aircraft Braking Systems Corporation, 1204 Massillon Road, Akron, Ohio 44306-4186. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington.

This amendment (39-6826, AD 90-25-15) becomes effective on December 24, 1990.