# STC SA4861NM - Type: Supplemental type certificate - Status: Current, Reissued - Holder: United Aeronautical Corporation, United States - Description: Installation of Retardant Tanks for the special purpose of Forest and Wildlife Conservation - Applied: January 10, 1990 - Status date: April 15, 2015 - Product: Aircraft, Large Airplane - Certification basis: Part 21, Part 25 - Data sheets: [TCDS A32NM](https://openairdocs.org/tcds/A32NM) - Certificate PDF: https://openairdocs.org/files/sha256/0f/92/0f92608654511312c8ece73802f1ce74cc0ead399432482f45f73db923c7d022 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E81790AF48BDF87786257E2A0061556A.0001 - DRS record last changed: December 6, 2025 - Page: https://openairdocs.org/stc/SA4861NM ## ADs that name it (0) None. ## Approved models (1) - USDA Forest Service P-3A ([TCDS A32NM](https://openairdocs.org/tcds/A32NM)) ## What the certificate says Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record. United States Of America Department of Transportation - Federal Aviation Administration Supplemental Type Certificate This certificate has been reissued to replace the original certificate reported as lost. **RESTRICTED CATEGORY** This Certificate issued to United Aeronautical Corporation 7360 Laurel Canyon Blvd. North Hollywood, California 91605 Part 25 of the Federal Aviation Regulations. A32NM USDA Forest Service P-3A Description of Type Design Change: Installation of Retardant Tanks for the special purpose of Forest and Wildlife Conservation in accordance with FAA approved Aero Union Master Drawing List 11700, N/C, dated January 17, 1990, or later FAA approved revision. The FAA approved Aero Union Airplane Flight Manual Supplement dated May 9, 1990, or later FAA approved revision is required as part of this approval. Limitations and Conditions : The approval of this change applies to P -3A airplanes only. This installation should not be incorporated in any aircraft unless it is determined that the interrelationship between this change and any previously approved configuration will not introduce any adverse effect upon the airworthiness of the aircraft. A copy of this STC must be included in the permanent records of the modified aircraft. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission. (See Continuation Sheet) Date of application : January 10, 1990 Date of issuance : May 11, 1990 Date reissued : April 15, 2015 Date amended : May 11, 1992 (Signature) Supervisor, Technical and Administrative Support Staff Los Angeles Aircraft Certification Office (Title) N umber SA4861NM LIMITATIONS AND CONDITIONS (Continued) Retardant drop shall be limited to speeds less than 150 knots and greater than 1.25 Vs and greater than Vmc. Max takeoff gross weight not to exceed 105,000 lbs. Max landing gross weight not to exceed 91,320 lbs Max landing gross weight not to exceed 105,000 lbs. provided: a. Landing at gross weight greater than 91,320 lbs. shall be made at a minimum rate of descent, and; b. Overweight landing inspection shall be performed after accumulating 10 landings in excess of 91,320 lbs. up to and including 105,000 lbs. Max zero fuel weight shall be 83,500 lbs. Max vertical acceleration shall be limited to 2.5G flight factor, flaps retracted. If operations in severe turbulence cannot be avoided, then do not exceed 65 kt above power off stall speed. Refer to the NATOPS Flight Manual, NAVAIR 01-75PAA-1. Turbulent penetration speed not to exceed 220 knots. Max retardant in each tank shall be limited to 27,000 lbs. No fuel will be carried in the wing center section fuel tank. Maintain equal fuel in each of the four wing fuel tanks. No cargo may be carried. Airplane to be operated unpressurized. Crewmen in the aft cabin must be protected with portable oxygen above 12,000 Ft. - END - ## Every issue (2) - April 15, 2015: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/0f/92/0f92608654511312c8ece73802f1ce74cc0ead399432482f45f73db923c7d022) - May 11, 1992: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/c2/05/c2051d0c830a47189e3e7d8cad167319e954ffbb1b7f209c83d4c4ec4158a165) --- 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.