AD 53-07-01

53-07-01 de HAVILLAND: Applies to Model DHC-2 (Beaver) Aircraft, Serial Numbers 1 to 483 Inclusive.

Compliance required as indicated.

There have been instances of the elevator outboard hinge becoming loose in its attachments to the horizontal stabilizer rib. Rivet holes have becomes enlarged permitting the fitting to "work". The de Havilland Aircraft of Canada, Ltd., in agreement with the Canadian Department of Transport, issued the following mandatory instructions in which the FAA concurs:

Inspection intervals: 50 hours, pending incorporation of the repair scheme described below.

Repair scheme: The repair scheme described herein is not mandatory until a defect appears. (See Fig. 1.)

The following parts are required:

C2-TP-179ND Hinge plate 2 required

C2-TP-181ND Angle 2 required 1 each CR 162-6-8 Cherry rivet 10 required end of CR 162-6-10 Cherry rivet 12 required T/P. CR 163-6-8 Cherry rivet 6 required

Procedure.1. Remove tailcone. 2. Remove elevator. 3. Locate extreme outboard elevator hinges on tailplane. 4. Drill out 4 rivets retaining hinge plates.

Important: Do not drill out rivet at point A until angle C2-TP-181ND has been riveted. (See Fig. 1.)

5. Remove small tab at outboard ends of rear spar on tailplane. 6. Drill out 3 rivets at point B securing angle C2-TP-139. (Angle must still remain in position secured by 1 rivet at point A.) 7. Locate new angle C2-TP-181ND on spar rear face and flush with outer skin of end rib. 8. Rivet angles C2-TP-139 and -181ND to spar as shown at point B. 9. Drill out rivet at point A. 10. Make or secure new hinge plate C2-TP-179ND and assemble as shown. 11. Assemble studs to new hinge plates. 12. Replace elevator and tailcone.

(de Havilland Technical News Sheet Series B, No. 60, dated February 10, 1953, Subject "Tailplane - Elevator Outboard Hinge - Mod. 2/901" covers this same subject.)