| AD Number | 91-18-16 | Status | Active |
| Effective Date | October 08, 1991 | Issue Date | Not specified |
| Docket Number | 91-NM-15-AD | Amendment | 39-8019 |
| Product Type | ["Aircraft"] | Product Subtype | ["Large Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Fokker Services |
| Model(s) | F27 Mark 050 F27 Mark 100 F27 Mark 200 F27 Mark 300 F27 Mark 400 F27 Mark 500 F27 Mark 600 F27 Mark 700 |
91-18-16 FOKKER: Amendment 39-8019. Docket No. 91-NM-15-AD.
Applicability: Model F-27 series airplanes; Serial Numbers 10102 through 10684, 10686, 10687, and 10689 through 10692; certificated in any category.
Compliance: Required as indicated, unless previously accomplished.
To prevent elevator and trim tab flutter during flight and reduced controllability of the airplane, accomplish the following;
(a) Within 100 hours time-in-service, unless accomplished within the previous 400 hours time- in-service, and thereafter at intervals not to exceed 500 hours time-in-service, perform a visual inspection to detect worn, loose, cracked, or broken parts in the elevator trim system, in accordance with the appropriate maintenance instructions referenced in the Fokker F27 Maintenance Circular 55-3, dated September 10, 1985. Repair any discrepant part(s) prior to further flight.
(b) Within 18 months after the effective date of this AD, modify the elevator trim systemin accordance with the Accomplishment Instructions of Fokker Service Bulletin F27/27-130, dated September 11, 1990. Accomplishment of this modification constitutes terminating action for the repetitive visual inspections required by paragraph (a) of this AD.
NOTE: This terminating action does not preclude the visual inspections of the elevator and trim tab that should be considered at the Check 4 or the 2C-check interval, which are recommended in Fokker Service Bulletin F27/27-130, dated September 11, 1990.
(c) An alternative method 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 forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Standardization Branch, ANM-113.
(d) 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.
(e) The inspection requirement shall be done in accordance with Fokker F27 Maintenance Circular 55-3, dated September 10, 1985, and the modification requirement shall be done in accordance with Fokker Service bulletin F27/27-130, dated September 11, 1990. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Fokker Aircraft USA, Inc., 1199 North Fairfax Street, Alexandria, Virginia 22314. Copies may be inspected at the FAA, Transport Airplane Directorate, Renton, Washington; or at the Office of the Federal Register, 1100 L Street N.W., Room 8401, Washington, D.C.
This amendment (39-8019, AD 91-18-16) becomes effective on October 8, 1991.