# AD 75-24-09: Ground Spoilers

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 737-100 Series and 737-200 Series
- Effective: September 12, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-3032
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1364DAF84877C50B86256E0D004921C4.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-24-09

## The airworthiness directive

75-24-09 BOEING: Amendment 39-2436 as amended by Amendment 39-3032. Applies to Model 737-100/-200 series airplanes listed in Boeing Service Bulletin 737-27-1080, certificated in all categories, compliance required as indicated. To prevent an inadvertent deployment of ground spoilers in flight after the loss of system "A" hydraulic pressure, accomplish one of the following: A. Within the next 100 hours time in service after the effective date of this AD, unless already accomplished, remove the existing placards, P/N BACM10H6CY and BAC27DHY195, and install warning placards, P/N BAC27DHY220 and BAC27DHY221, or equivalent placards approved by the FAA assigned maintenance inspector, in accordance with the instructions contained in Boeing Service Bulletin 737-29-1027 dated December 20, 1974, or later revisions, or any other equivalent placard, approved by the Chief, Engineering and Manufacturing Branch, Northwest Region, near the hydraulic pressure filling installation, on the hydraulic system "A" reservoir, and at the ground service hydraulic module. These placards warn that servicing the 737 airplane with Stauffer Aero Safe ER hydraulic fluid is prohibited. The improved lubricity characteristics of the ER fluid may permit the unlocking of the ground spoiler actuators in flight if/when hydraulic system "A" fails; or B. Unless already accomplished, accomplish the following in accordance with the applicable instructions contained in Boeing Service Bulletin 737-27-1080 dated November 21, 1975, or later FAA approved revisions: 1. Remove and rework ground spoiler actuators, P/N 65-44851-3, -4, -5, or -6 and 65- 44961-2, -4, or -5; and 2. Reidentify the reworked ground spoiler actuators; and 3. Reinstall the reworked and reidentified ground spoiler actuators, P/N 65-44851-7 and 65-44961-6; and 4. Remove warning placards, P/N BAC27DHY221 and BAC27DHY220, or equivalent placards; and 5. Install service placards, P/N BAC27DHY195 and BAC27DHY233, or equivalent placards approved by the FAA assigned maintenance inspector. Airplanes having complied with paragraph B above are compatible with hydraulic fluids that have been qualified to Boeing Specification BMS 3-11 including Stauffer Aero Safe ER Type IV hydraulic fluid. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive, who have not already received these documents from the manufacturer, may obtain copies upon request to Boeing Commercial Airplane Company, P. O. Box 3707, Seattle, Washington 98124. The documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington.

Amendment 39-2436 superseded AD 75-08-06. Amendment 39-2436 became effective December 2, 1975. This amendment 39-3032 becomes effective September 12, 1977.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A16WE](https://openairdocs.org/tcds/A16WE): The Boeing Company; names 2 of 17 models: 737-100 Series, 737-200 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 737-205](https://openairdocs.org/model/boeing-737-205): 3 aircraft (airframe model)
- [Boeing 737-200](https://openairdocs.org/model/boeing-737-200): 1 aircraft (airframe model)
- [Boeing 737-201](https://openairdocs.org/model/boeing-737-201): 1 aircraft (airframe model)
- [Boeing 737-209](https://openairdocs.org/model/boeing-737-209): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/75-24-09/models.md
Every aircraft: https://openairdocs.org/ad/75-24-09/aircraft.md

Its text cites no advisory circulars or STCs.

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