AD 82-03-07

82-03-07 ROBINSON HELICOPTER COMPANY: Amendment 39-4324. Applies to Model R-22, certified in all categories. Compliance required as indicated, unless already accomplished.

To prevent failure of the main rotor blade which would result in loss of control and crash of the helicopter, accomplish the following:

(a) Prior to further flight, after the effective date of this AD, remove all main rotor blades P/N A016-1, Revision A through Revision V, (S/N 0100 through S/N 0593) from service.

(b) Mark all main rotor blades, P/N A016-1, Revision A through Revision v, (S/N 0100 through S/N 0593), "UNAIRWORTHY" in letters at least 1/2" high and mark "UNAIRW0RTHY" on data plate using a metal stamp.

(c) The life limit for main rotor blades P/N A016-1, Revision W, (S/N 0600 through D81'0), previously established at 300 hours had been increased to 1,000 hours based I on fatigue testing.

(d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199to operate helicopters to a base for the accomplishment of actions required by this AD.

(e) Alternative inspections, modifications or other actions which provide an equivalent level of safety may be used when approved by the Chief, Western Aircraft Certification Field Office, FAA Northwest Mountain Region.

This supersedes priority mail AD 81-24-10 which had superseded AD 81-19-03, Amendment 39-4224 (46 FR 47442).

This amendment becomes effective March 4, 1982, to all persons except those to whom it was made immediately effective upon receipt of Emergency AD 82-03-07 dated January 29, 1982.