# AD 90-15-07: Air Conditioning System - Type: Airworthiness directive - Status: Current - Products: Short Brothers SD3-60 with STC SA3749SW - Effective: July 31, 1990 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-6661 - Docket: 90-NM-137-AD - Registered aircraft: 26 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2D6C8B75E694004786256A240047DE84.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/90-15-07 ## The airworthiness directive 90-15-07 SHORT BROTHERS, PLC: Amendment 39-6661. Docket No. 90-NM-137-AD. Applicability: Model SD3-60 series airplanes, equipped with AAR Oklahoma, Inc., freon air conditioning system, installed in accordance with Supplemental Type Certificate (STC) SA3749SW, certificated in any category. Compliance: Required as indicated, unless previously accomplished. To prevent an electrical fire and subsequent loss of essential equipment and/or flight instruments, accomplish the following: A. Within 10 days after the effective date of this AD, inspect electrical panels 1C, 2C, 2D, and 6D to verify that all wiring and terminals are installed in accordance with Advisory Circular (AC) 43.13-1A. If there is evidence of arcing or burnt wires, prior to further flight, replace any defective wires and terminals. B. Within 10 days after the effective date of this AD, accomplish either sub-paragraph 1. or 2., below: 1. Modify the air conditioning system wiring installation and install a new placard on the co-pilot's audio panel, in accordance with AAR Oklahoma, Inc., Service Information Letter 5-90-1, dated June 7, 1990; and revise the Airplane Flight Manual (Document No. 18R008, Freon Air Conditioner Flight Manual Supplement) by incorporating Revision A, dated June 7, 1990; or 2. Deactivate the air conditioning system as follows: a. In Panel 1C, remove wire HH1A-2P (2 gauge wire) connected to the left- hand general service bus; cap and stow this wire. b. In Panel 2C, remove wire HH101A-2P (2 gauge wire) connected to the right-hand general service bus; cap and stow this wire. c. Locate the ground service circuit breakers located in panel 2D or 6D; pull the two 20 amp and the two 2 amp circuit breakers; and install a suitable collar around each circuit breaker shaft to prevent them from being reset. C. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Airplane Certification Office, ASW-150, FAA, Southwest Region. NOTE: The request should be submitted directly to the Manager, Airplane Certification Office, ASW-150, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Airplane Certification Office, ASW-150. D. Special flight permits may be issued in accordance with FAR Sections 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to AAR Oklahoma, Inc., 6611 S. Meridian Avenue, P.O. Box 59100, Oklahoma City, Oklahoma 73159. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or the FAA, Southwest Region, Airplane Certification Office, 4400 Blue Mound Road, Fort Worth, Texas. This amendment (39-6661, AD 90-15-07) becomes effective on July 31, 1990. ## 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: 26 (26 by airframe model, 0 by engine model) - Makers: Short Bros 26 Models with the most aircraft: - [Short Bros SD3-60](https://openairdocs.org/model/short-bros-sd3-60): 26 aircraft (airframe model) All 1 models: https://openairdocs.org/ad/90-15-07/models.md Every aircraft: https://openairdocs.org/ad/90-15-07/aircraft.md ## Related documents - [AC 43.13-1B CHG 1 Ed Update](https://openairdocs.org/ac/43.13-1): Acceptable Methods, Techniques, and Practices—Aircraft Inspection and Repair. Cited as AC 43.13-1A in the AD's requirements - [STC SA3749SW](https://openairdocs.org/stc/SA3749SW): Installation of air conditioning system.. AAR Airframe and Accessories Group, 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.