- Models
- C-46A, C-46D, C-46F, C-46R, C-46E, C-46A and 9 more
- Registered aircraft
- 7 matched by model
- Product
- Aircraft · Large airplane
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
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| FAA DRS HTML | 26 KB | 71400e38…fd838cb | FAA DRS (API key needed) |
On this page
The airworthiness directive
54-14-01 CURTISS-WRIGHT: Applies to all Model C-46 Series aircraft.
Compliance required as indicated.
A. Inspection.
1. Carefully inspect the outboard horizontal stabilizer rib, which supports the outboard elevator hinge, left and right, P/N 20-110-5014-2 and angles, P/N 20-110-5014-4 for cracks in the area from the rib end to a point at least 6 inches forward of the trailing edge of the stabilizer.
(a) On aircraft which do not have the modification described in paragraphs B1 and B2 below, this inspection is required every 100 hours.
(b) On aircraft which do have the modification described in paragraphs B1 and B2 below, this inspection is required every 800 hours.
(c) Deleted, March 28, 1955.
B. Replacement.
1. If cracks are found in the angles, P/N 20-110-5014-4, remove and replace with a similar angle fabricated from 0.040 24ST or 0.040 24SO aluminum allow sheet. Specification No. AN A-13, condition A, heat treat in accordance with Specification AN 01-1A- 1.
2. If cracks are found in the rib, P/N 20-110-5014-2, reinforce each rib as follows:
(a) Fabricate (per airplane) four angles, P/N 20-110-5014-1201 from 0.051 24STAL sheet, 15 inches long with 0.62 x 0.71 inch leg, and install at top and bottom on outboard side of rib and extending forward from the forward edge of hinge block assembly, P/N 20-110-5112-3 or 20-110-5070-502. 24ST aluminum alloy extrusion, Alcoa Die No. 12883, may be used as an alternate material if desired. Pick up existing rivets in the rib and skin.
(b) Fabricate (per airplane) four angles, P/N 20-110-5014-1202 from 0.051 24STAL sheet, 8.80 inches long with 0.62 x 0.71 inch legs and install angles on inboard side of rib at top and bottom, picking up the six bolts in the hinge block assembly P/N 20-110-5112-3 or 20-110-5020-502, and extending forward 8.80 inches from the end of the rib. 24ST aluminum alloy extrusion Alcoa Die No. 12883 may be used as an alternate materialif desired. In addition to picking up the existing rivets, add three additional rivets at top and bottom between the existing rivets through the web of the rib assembly, and add four rivets, both top and bottom through the flange of the rib and leg of the angle.
(c) To assemble reinforcement angles called for in parts (a) and (b), the following modifications to the existing structure are necessary:
(1) Cut clip, P/N 20-110-5033-1 to clear angles - 1201 and install.
(2) Cut angle P/N 20-110-5014-5 to clear angles - 1202 and install.
(3) Cut skin, P/N 20-110-5001-66, to clear angles - 1202 and replace rivets.
(Army Technical Order 01-25L-103 or Curtiss-Wright Service Information Letters: SBS:ASF:asf-7195, dated October 26, 1946, and its enclosures, cover this same subject.)
This supersedes AD 47-51-1.
Affected TCDS · 2
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 7
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1942 | 1 |
|---|---|
| 1944 | 4 |
| 1945 | 1 |
| 1959 | 1 |