AD 98-21-16 63 FR 54039

This amendment supersedes Airworthiness Directive (AD) 98-12- 23, which currently requires replacing the windshield wiper arm attachment bolts and windshield wiper arm on all British Aerospace (BAe) Model H.P. 137 Jetstream Mk. 1, Jetstream Series 200, and Jetstream Models 3101 and 3201 airplanes. AD 98-12-13 also requires measuring the material thickness of the upper and lower toggle attachment brackets on the nose landing gear of the affected airplanes, and replacing the toggle attachment bracket lugs. This AD is the result of additional mandatory continuing airworthiness information (MCAI) pertaining to this subject received from the airworthiness authority for the United Kingdom. This AD would retain the actions of AD 98-12- 23; would make certain actions repetitive; and would change the reference to certain service information currently utilized. The actions specified in this AD are intended to prevent the windshield wiper arm from corroding, detaching from the airplane during flight, and penetrating the fuselage, which could result in possible injury to the pilot and passengers; and to prevent collapse of the nose landing gear caused by the current design, which could result in loss of control of the airplane during landing operations.