# AD 75-13-01: Main Rotor Assembly

- Type: Airworthiness directive
- Status: Current
- Products: Sikorsky S-58A, S-58B, S-58BT, S-58C, S-58D, S-58DT, S-58E, S-58ET, S-58F, S-58FT, S-58G, S-58H and 3 more
- Effective: May 20, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-2879
- Registered aircraft: 22 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/78BAA87545A05E6386256A56004719BE.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-13-01

## The airworthiness directive

75-13-01 SIKORSKY AIRCRAFT: Amendment 39-2238 as amended by Amendment 39-2879. Applies to S-58A, S-58B, S-58C, S-58D, S-58E, S-58F, S-58G, S-58H, S-58J, S- 58BT, S-58DT, S-58ET, S-58FT, S-58HT, S-58JT helicopters certificated in all categories, including Military Type HSS-1, HSS-1F, HSS-1N, HUS-1, HUS-1A, HUS-1AN, HUS-1G, HUS- 1Z, H-34A, H-34C, H-34J, CH-34A, CH-34C, HH-34F, SH-34G, SH-34H, SH-34J, UH-34D, UH-34E, UH-34G, UH-34J, VH-34C and VH-34D helicopters. To prevent operation with fatigue cracks in the main rotor magnesium stationary stars, P/Ns S1610-24013-0, S1610-24013- 1, and S1610-24013-2, accomplish the following:

  (a) Prior to the first flight of each day, conduct visual inspections of stationary star for cracks in the areas around the recesses and edges surrounding the recesses, inboard of all of the trunnion lugs.

  (b) For stationary stars with more than 250 hours time in service: Within 5 hours time in service after the effective date of this AD, unless alreadyaccomplished, and at 50 hour intervals thereafter, conduct dye penetrant inspections of the areas described in paragraph (a) for cracks.

  (c) If a crack is found during the above inspections, replace the cracked stationary star with a star that has been inspected in accordance with paragraph (b) above and found to be free of cracks, prior to flight.

Sikorsky Alert Service Bulletin 58B10-10 covers this inspection.

Amendment 39-2238 became effective upon publication in the FEDERAL REGISTER for all persons except those to whom it was made effective immediately by telegram dated May 16, 1975.

This amendment 39-2879 becomes effective May 20, 1977.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1H11](https://openairdocs.org/tcds/1H11): Centerpointe Aerospace Inc.; names 15 of 15 models: S-58J, S-58FT, S-58C, S-58A, S-58HT, S-58F, S-58G, S-58ET…

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 22 (22 by airframe model, 0 by engine model)
- Makers: Sikorsky 22

Models with the most aircraft:

- [Sikorsky S-58JT](https://openairdocs.org/model/sikorsky-s-58jt): 5 aircraft (airframe model)
- [Sikorsky S-58ET](https://openairdocs.org/model/sikorsky-s-58et): 3 aircraft (airframe model)
- [Sikorsky S-58C](https://openairdocs.org/model/sikorsky-s-58c): 3 aircraft (airframe model)
- [Sikorsky S58E](https://openairdocs.org/model/sikorsky-s58e): 3 aircraft (airframe model)
- [Sikorsky S-58J](https://openairdocs.org/model/sikorsky-s-58j): 2 aircraft (airframe model)
- [Sikorsky S-58H](https://openairdocs.org/model/sikorsky-s-58h): 2 aircraft (airframe model)
- [Sikorsky S-58B](https://openairdocs.org/model/sikorsky-s-58b): 1 aircraft (airframe model)
- [Sikorsky S-58D](https://openairdocs.org/model/sikorsky-s-58d): 1 aircraft (airframe model)
- [Sikorsky S-58BT](https://openairdocs.org/model/sikorsky-s-58bt): 1 aircraft (airframe model)
- [Sikorsky S-58DT](https://openairdocs.org/model/sikorsky-s-58dt): 1 aircraft (airframe model)

All 10 models: https://openairdocs.org/ad/75-13-01/models.md
Every aircraft: https://openairdocs.org/ad/75-13-01/aircraft.md

Its text cites no advisory circulars or STCs.

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