# AD 57-19-01: Elevator Rod End Bearing

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-23
- Published: January 23, 1958
- Issued: January 23, 1958
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 155 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4995BA62D1ED3BAF8625698B00764E43.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/57-19-01

## The airworthiness directive

57-19-01 PIPER: Applies to Model PA-23, Serial Numbers 23-129, 23-132 to 23-228 Inclusive; 23-230 to 23-766 Inclusive; 23-768 to 23-850 Inclusive; 23-852 to 23-883 Inclusive; 23-885 to 23-937 Inclusive; 23-939 to 23-1017 Inclusive; 23-1019, 23-1020, 23-1022 to 23-1030 Inclusive; 23-1032 to 23-1042 Inclusive; 23-1044, 23-1046 to 23-1057 Inclusive; 23-1059 to 23- 1064 Inclusive; 23-1066, 23-1069 to 23-1074 Inclusive; 23-1076, 23-1078 to 23-1082 Inclusive.

Compliance required by November 1, 1957.

Inspect the Heim rod end bearing (P/N HMX-4M) located where the front elevator control tube attaches to the lower horn on the control column. If more than six threads show on the rod end, rerig the control column so that six or less threads are exposed.

(Piper Service Bulletin No. 156 dated July 2, 1957, covers this subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1A10](https://openairdocs.org/tcds/1A10): Piper Aircraft Inc.; names 1 of 6 models: PA-23

## 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: 155 (155 by airframe model, 0 by engine model)
- Makers: Piper 155

Models with the most aircraft:

- [Piper PA-23](https://openairdocs.org/model/piper-pa-23): 155 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/57-19-01/models.md
Every aircraft: https://openairdocs.org/ad/57-19-01/aircraft.md

Its text cites no advisory circulars or STCs.

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