AD 73-20-08

73-20-08 UNIVAIR AIRCRAFT CORPORATION (formerly Koppers): Amendment 39-1730. Applies to all propeller blades eligible in Models F200, F200H, and 220 propellers.

Compliance: Required after receipt of this Airworthiness Directive and before further flight unless already accomplished. The inspection specified in (a) below must be performed. Propeller blades found to have defective tipping must be repaired or replaced before further flight. Propeller blades found to have the late style one piece tipping, but which have no apparent defects must be returned to Univair Aircraft Corporation, Route 3, Box 59, Aurora, Colorado 80010, within the next 25 hours of flight for inspection and rework or replacement as found necessary.

(a) Visually inspect the propeller blade tipping for evidence of loosening, loose rivets or deteriorated wood under the tipping. Measure the distance from the blade tipping outboard end to the first relief cut in the stainless steel tipping material inboardfrom the tip. Blades on which there is no relief cut in the stainless steel tipping material in the first five and one-half (5 1/2) inches inboard from the tip have the late style, one piece tipping installed.

Service Bulletin No. 29 on this same subject is available from Univair Aircraft Corporation, Route 3, Box 59, Aurora, Colorado 80010.

This amendment becomes effective October 4, 1973.