# AD 58-17-04: Water Rudder Modification

- Type: Airworthiness directive
- Status: Current
- Products: Piaggio & C. P.136-L1 and P.136-L2
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 8 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D7E0AA5389B2201D86256A45006AC747.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/58-17-04

## The airworthiness directive

58-17-04 PIAGGIO: Applies to All Models P.136-L1 and P.136-L2 Aircraft. Compliance required by December 1, 1958. Several cases have occurred where the water rudder inadvertently dropped into the extended position during water landings. In order to avoid future occurrences, Piaggio & Co. recommends that a hook be incorporated at the water rudder retraction cylinder, which is controllable by the pilot. In addition, the forward section of the water rudder should be cut off, in order to prevent any interference with the retraction of the water rudder because of the accumulation of debris. This modification is considered mandatory by the Registro Aeronautico Italiano. The FAA concurs and considers compliance therewith mandatory. (Piaggio & Co. Change Order No. 36 L-42, dated May 29, 1958, covers the same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-813](https://openairdocs.org/tcds/A-813): Piaggio & C.; names 2 of 3 models: P.136-L1, P.136-L2

## 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: 8 (8 by airframe model, 0 by engine model)
- Makers: Piaggio 8

Models with the most aircraft:

- [Piaggio P.136-L1](https://openairdocs.org/model/piaggio-p-136-l1): 6 aircraft (airframe model)
- [Piaggio P.136-L2](https://openairdocs.org/model/piaggio-p-136-l2): 2 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/58-17-04/models.md
Every aircraft: https://openairdocs.org/ad/58-17-04/aircraft.md

Its text cites no advisory circulars or STCs.

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