# AD 64-02-02: Autopilot

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 707-100 Long Body, 707-100B Long Body, 707-100B Short Body, 707-200, 707-300 Series, 707-300B Series, 707-300C Series, 707-400 Series, 720 Series and 720B Series
- Effective: January 17, 1964
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AE2C903C15E40C2C8625699100751429.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/64-02-02

## The airworthiness directive

64-02-02 BOEING: Amdt 673 Part 507 Federal Register January 17, 1964. Applies to All Models 707 and 720 Series Aircraft With Boosted Rudder and Extended Vertical Fin Configuration.

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

To eliminate a possible hazard to operational safety during autopilot coupled approaches accomplish either (1) or (2) of the following or an equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA Western Region:

  (1) Eliminate autopilot rudder crossfeed by the following circuit modification. In the RJ3 junction box disconnect wire C144A22 from terminal E18 and connect to terminal E17. In the autopilot adapter unit, Boeing P/N 10-3056-2 or Eclipse-Pioneer P/N 15236-2A1 loosen the locking nut and turn shaft of R5 potentiometer to zero setting. Conduct a continuity check between pins D and E. A reading which indicates 5 ohms or less must be obtained.

(Boeing Service Bulletin 1797 covers this same subject.)

  (2) Limit rudder crossfeed by the following circuit modification. Insert a 5600 ohm, one half watt 5 percent resistor sleeved in No. 4 plastic tubing in the circuit from terminal E18 of junction box RJ3 to terminal (E) of connector RD921 by connecting one end of the resistor to terminal E18 and the other end to a new standoff terminal and moving wires C144B22 from terminal E18 to the new standoff terminal. Insert two Transitron No. SG22 diodes paralleled in opposite polarity and sleeved in No. 11 plastic tubing between terminals E17 and E18 of junction box RJ3. In the autopilot adapter unit, Boeing P/N 10-3056-2 or Eclipse-Pioneer P/N 15236-2A1 loosen the locking nut and turn shaft of R5 potentiometer to a setting of 10.

(Boeing Figure 1, CDP-150, page 3, revised September 9, 1963, covers this same subject.)

This supersedes AD 63-05-01.

This directive effective January 17, 1964.

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4A21](https://openairdocs.org/tcds/4A21): The Boeing Company; names 4 of 4 models: 707-100B Short Body, 707-200, 707-100 Long Body, 707-100B Long Body
- [TCDS 4A26](https://openairdocs.org/tcds/4A26): The Boeing Company; names 4 of 4 models: 707-300B Series, 707-400 Series, 707-300 Series, 707-300C Series
- [TCDS 4A28](https://openairdocs.org/tcds/4A28): The Boeing Company; names 2 of 2 models: 720B Series, 720 Series

## 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: 6 (6 by airframe model, 0 by engine model)
- Makers: Boeing 6

Models with the most aircraft:

- [Boeing 707-338C](https://openairdocs.org/model/boeing-707-338c): 2 aircraft (airframe model)
- [Boeing 707-368C](https://openairdocs.org/model/boeing-707-368c): 1 aircraft (airframe model)
- [Boeing 707-321B](https://openairdocs.org/model/boeing-707-321b): 1 aircraft (airframe model)
- [Boeing 707-323B](https://openairdocs.org/model/boeing-707-323b): 1 aircraft (airframe model)
- [Boeing 707-351B](https://openairdocs.org/model/boeing-707-351b): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/64-02-02/models.md
Every aircraft: https://openairdocs.org/ad/64-02-02/aircraft.md

Its text cites no advisory circulars or STCs.

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