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FEDERAL
VOLUME 23

REGISTER
1934

Nnto

NUMBER 103

Washington, Saturday, May 24, 1958

TITLE 14 CIVIL AVIATION
Chapter II Civil Aeronautics Admin istration, Department of Commerce Amdt. 7
P art 507A irworthiness D irectives MISCELLANEOUS AMENDMENTS

This amendment to Part 507 contains the Airworthiness Directives amended or issued during April 1958. Individual no tice of the Airworthiness Directives con tained herein has been given to opera tors and other interested persons who are subscribers to a Civil Aeronautics Administration mailing service.
In the interest of safety, compliance with the notice, procedures and effective date provisions of section 4 of the Ad ministrative Procedures Act is imprac ticable and contrary to the public in terest, and therefore, is not required.
Section 507.10 a is amended as fol lows:
1. 53-19-1 Douglas DC-4 and C-54
series aircraft as it appeared in 21 P. R.
9526 is amended by revising the second sentence to read: In view of the fire hazard existing in the use of the mag nesium cooling fan in the Eclipse Type 901 generator in the DC-4 and C-54
series aircraft installations, the mag nesium fan as a unit must be removed and Eclipse-Pioneer spacer P/N 866570
installed in its place.
2. 48-17-3 Sikorsky S-51 helicopters as it appeared in 21 P. R. 9484 is amended by changing the required inspection and replacement periods from 400 hours to 800 hours. Sikorsky Aircraft Service Information Circular No. 8, Revision C dated February 27, 1950, covers the same subject.
3. 58-6-2 Hartzell HC-82XF/8833-0
88-inch diameter propellers as it ap peared in 23 P. R. 2569 is amended by changing compliance to Prior to next flight.
4. 56-23-1 and 56-25-3 Hamilton Standard blades 6969 and 6967 as they appeared in 22 P. R. 2420 and 2421 are canceled.
5. 57-2-2 Lycoming engine Models GOand GSO-480 as it appeared in 22
P. R. 6047 is canceled.
6. The following new airworthiness directives are added:

58-7-1 HARTZELL. Applies to All Hart zell HC-12X20, HO-13X20, HC-82X
Series and HC-83X Series Propellers.
Compliance required at the next propeller overhaul.
To minimize the possibility of fatigue failure of the split rings used to retain the blades in the hub, replace all unmarked split rings with new split rings marked with the letter N. The new production rings have a higher safety factor. Recent failures involving the old type split rings have been covered in airworthiness directives con cerned with the particular propeller model or hub-blade combination involved. Hart zell Service Bulletin No. 58 covers this same subject.
58-7-2 LOCKHEED. Applies to All Lock heed Model 18 Aircraft.
Compliance required not later than July 1, 1958, and at each 1,000 hours of operation thereafter.
A number of reports hs been received relative to cracks in the welds of the drag brace yoke P/N XY450-2L-1 on the main landing gear. These cracks, as they progress, result in a continuing reduction in the strength of the landing gear and hence ren der the landing gear unairworthy.
" I t is therefore necessary to inspect the main landing gear by means of dye pene trant, magnetic particle or equivalent in spections for cracks in the area indicated above.
In the event cracks are found the oleo strut must be replaced. If the olea strut is replaced by a new part, the above inspec tions need not be resumed until after 3,000
hours of service.
5873 VICKERS. Applies to All Viscount 700 Series Aircraft.
Compliance required before accumulation of 6,000 flight hours.
Investigations have proved it is necessary to replace the y2 inch diameter bolts secur ing the top inboard attachment fittings of the inner nacelles to the leading edge mem ber at Station 96 at 6,000 hours.
The Part Number of the bolts, which are to be replaced at 6,000 hours are as follows:
70103-4405 Mod. D. 1031 embodied, 802032405 Mod. D. 1237 or D. 2025 embodied.
Vickers Modification D. 2581 introduces redesigned nuts and bolts as direct replace ment for the above bolts. This design en sures that any bending moments present will be taken by the full shank diameter of the bolts. The modified bolt assemblies are split pinned.
Vickers-Armstrongs have issued Modifica tion Bulletin No. D. 2581, which the British Air Registration Board considers manda tory. The CAA concurs and considers com pliance therewith mandatory.
Continued on next page
CONTENTS
Agricultural Marketing Service
Proposed rule making:
Milk in Chattanooga, Tenn___
Rules and regulations :
Lemons grown in California and Arizona; limitation on handling_____________________
Peaches; fresh, grown in Geor gia:
Limitation of shipments____
Suspension of inspection re quirement______________
Tomato juice; U. S. standards for grades________________
Walnuts grown in California, Oregon, and Washington; in crease in aggregate expenses,
pa8

3596

3593
3593
3594
3592
3594

Agriculture Department
See Agricultural Marketing Service; Commodity Stabilization Service.
Alien Property Office
Notices:.
Vested property, intention to return:
Blttler, Josef____________ 3607
Hofe, Annemarie Kalau v___ 3607
Civil Aeronautics Administra tion
Rules and regulations:
Airworthiness directives ; mis cellaneous amendments_____ 3585
Standard instrument approach procedures; alterations . _ 3588
Commerce Department
See Civil Aeronautics Adminis tration.
Commodity Stabilization Service
Proposed rule making :
Sugar quotas; mainland cane sugar area________________ 3599
Federal Power Commission
Notices :
Hearings, etc. :
Alkek, A. B_______
3603
Gulf Oil Corp. et al________
3602
Humble Oil & Refining Co__ 3603
Rasberry, Elge, et al________ 3603
Texas Illinois Natural Gas Co __________________ 3604
Fish and Wildlife Service
Rules and regulations:
A l a s k a commercial fisheries;
Bristol Bay area; curtailment of fishing____________ ;____ 3596
3585