AD 98-06-07 Airworthiness Directives; Fokker Model F28 Mark 0100 Series Airplanes

Models named: F28 Mark 0100 series. Read the applicability below — it usually turns on serial or part numbers too.

Model F28 Mark 0100 series airplanes equipped with Rolls-Royce (RR) Tay 650-15 engines, certificated in any category. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Required as indicated, unless accomplished previously. To prevent stabilized engine operation in a certain engine speed range on the ground, which could result in uncontained engine fan blade failure due to high cycle fatigue cracking, accomplish the following: (a) Within 72 hours after October 27, 1997 (the effective date of AD 97-19-16, amendment 39-10169), revise the Limitations Section, Subsection 2.06.01 ``Thrust Reverser,'' of the FAA-approved Airplane Flight Manual (AFM) to add the following. This may be accomplished by inserting a copy of this AD in the AFM. ``THRUST REVERSER Thrust reversers are intended for ground use only. Intentional use of reverse thrust in flight is prohibited. After reverse thrust has been initiated, a full stop landing must be made. Maximum Reverse Thrust Lever Positions Normal Operation: --The idle detent position shall not be exceeded in normal operation. Emergency Operation: --In case of emergency, the emergency maximum reverse thrust may be used. --Stabilized operation with the reverse lever in an intermediate position between idle reverse and emergency maximum reverse is prohibited. --If directional control problems occur, select forward idle. Exceeding the idle reverse thrust limitations must be reported.'' (b) Within 72 hours after the effective date of this AD, remove the revision to the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) required by AD 97-19-16, amendment 39-10169, and revise the Limitations Section of the FAA-approved AFM to add the following. This may be accomplished by inserting a copy of this AD in the AFM. ``LIMITATIONS POWERPLANT and APU LIMITATIONS OPERATING LIMITS To avoid high fan blade stresses, stabilized operation in the speed range between 60% and 75% Low Pressure Rotational Speed (N1) is not permitted during Ground Operations in Forward or Reverse Thrust, except that passing through this range while increasing or decreasing thrust is permitted. [[Page 11987]] THRUST REVERSER Thrust reversers are intended for ground use only. Intentional use of reverse thrust in flight is prohibited. After reverse thrust has been initiated, a full stop landing must be made. Maximum Reverse Thrust Lever Positions Normal Operation: --The idle detent position shall not be exceeded in normal operation. --Momentarily exceeding the idle detent position, while selecting idle reverse, is acceptable. Emergency Operation: --In case of emergency, the emergency maximum reverse thrust may be used. --If directional control problems occur, reduce to idle reverse or select forward idle. --Stabilized operation with the reverse lever in an intermediate position between idle reverse and emergency maximum reverse is prohibited, except (where approved) during Power-Back operations.'' Note 2: Fokker Services Manual Change Notification--Operational Documentation (MCNO) No. F100-006, dated November 27, 1997, contains information that pertains to this subject. Rolls-Royce PLC Engine Operating Instruction Manual Reference F-TAY-3RR, revised by transmittal letter No. 13 dated October 15, 1997, also pertains to this subject. (c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, International Branch, ANM-116, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Operations Inspector, who may add comments and then send it to the Manager, International Branch, ANM-116. Note 3: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the International Branch, ANM-116. (d) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. Note 4: The subject of this AD is addressed in Dutch airworthiness directive 1997-110/2 (A), dated January 30, 1998. (e) This amendment becomes effective on March 27, 1998. Issued in Renton, Washington, on March 5, 1998. Darrell M. Pederson, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 98-6329 Filed 3-11-98; 8:45 am] BILLING CODE 4910-13-U