# AD 66-30-01: Static Pressure Line

- Type: Airworthiness directive
- Status: Current
- Products: Textron C-45G, C-45H, D18C, D18S, E18S, E18S-9700, JRB-6, TC-45G and TC-45J with STC SA111WE or SA4-1531
- Published: December 21, 1966
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-325
- Registered aircraft: 179 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2559C107CF62C74086256D500042A390.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/66-30-01

## The airworthiness directive

66-30-01 BEECH: Amdt. 39-325 Part 39 Federal Register December 21, 1966. Applies to Model JRB-6, D18C, D18S, E18S, E18S-9700 with Serial Numbers prior to BA445, C-45G, TC-45G, C-45H, and TC-45J (SNB-5) Airplanes That Have Been Modified in Accordance with Volpar, Inc., Supplemental Type Certificate No. SA4-1531 or SA111WE.

Compliance required within the next 100 hours' time in service after the effective date of this AD, unless already accomplished.

To prevent moisture from collecting in the static line of the subject airplanes, accomplish the following:

Install a drain in the static line in accordance with Volpar, Inc., Drawing No. 857, titled "Drain Installation - Static Pressure Line" dated 9-22-66 (Volpar, Inc., Service Bulletin No. 10, page 2) or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region.

Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Regional Director, FAA Western Region, may adjust the compliance time if the request contains substantiating data to justify the adjustment for that operator.

This directive effective December 21, 1966.

This amendment effective March 1, 1967.

Revised March 1, 1967.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-765](https://openairdocs.org/tcds/A-765): Textron Aviation Inc.; names 9 of 17 models: E18S-9700, TC-45J, TC-45G, C-45H, C-45G, E18S, D18S, D18C…

## 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: 179 (179 by airframe model, 0 by engine model)
- Makers: Beech 179

Models with the most aircraft:

- [Beech D18S](https://openairdocs.org/model/beech-d18s): 55 aircraft (airframe model)
- [Beech E18S](https://openairdocs.org/model/beech-e18s): 51 aircraft (airframe model)
- [Beech C-45H](https://openairdocs.org/model/beech-c-45h): 50 aircraft (airframe model)
- [Beech C-45G](https://openairdocs.org/model/beech-c-45g): 9 aircraft (airframe model)
- [Beech E18S-9700](https://openairdocs.org/model/beech-e18s-9700): 7 aircraft (airframe model)
- [Beech TC-45J](https://openairdocs.org/model/beech-tc-45j): 5 aircraft (airframe model)
- [Beech TC-45G](https://openairdocs.org/model/beech-tc-45g): 2 aircraft (airframe model)

All 9 models: https://openairdocs.org/ad/66-30-01/models.md
Every aircraft: https://openairdocs.org/ad/66-30-01/aircraft.md

## Related documents

- [STC SA111WE](https://openairdocs.org/stc/SA111WE): Installed Volpar Mark IV tricycle landing gear.. SOUTHWESTERN AERO EXCHANGE INC., Named in the applicability
- [STC SA4-1531](https://openairdocs.org/stc/SA4-1531): Installation of Tricycle landing gear and revised nose assembly with optional radome.. SOUTHWESTERN AERO EXCHANGE INC., Named in the applicability

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.