# AD 85-25-10: Placard - Icing Conditions - Type: Airworthiness directive - Status: Current - Products: Cessna 552 and S550 - Effective: February 11, 1986 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small/large airplane - Amendment: 39-5224 - Registered aircraft: 94 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D9E20D307BCDD7D3862569BA004BDC83.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/85-25-10 ## The airworthiness directive 85-25-10 CESSNA AIRCRAFT COMPANY: Amendment 39-5224. Applies to Cessna Model S550 and 552 airplanes, with unit numbers identified below, certificated in any category. MODEL UNIT NUMBERS S550 0001 thru 0048, 0051 thru 0075, 0077, and 0079 552 -0001 thru -0015 Compliance is required as indicated, unless already accomplished. To prevent hazardous accumulation of ice on the wing leading edge and horizontal stabilizer during flight in icing conditions, accomplish the following: A. Prior to further flight: 1. Fabricate and install on the instrument panel, in clear view of the pilot, the following placard, using letters of a minimum of 0.10 inch in height: "FLIGHT INTO KNOWN OR FORECAST ICING PROHIBITED," and operate the airplane accordingly. 2. Revise the Airplane Flight Manual, Section II, Operating Limitations - Operations Authorized to read: "This airplane is approved for day and night, VFR, IFR flight. Flight into known or forecast icing conditions prohibited." This may be accomplished by inserting a copy of this AD in the Airplane Flight Manual. B. Within the next 15 flight hours or 15 days after the effective date of this AD, whichever occurs first, inspect and modify, as necessary, the fluid ice protection system left and right inboard wing installation in accordance with Accomplishment Instruction A. of Cessna Alert Service Letter SLAS550-30-05, dated December 17, 1985. C. Within the next 25 flight hours or 30 days after the effective date of this AD, whichever occurs first, inspect and modify, as necessary, the fluid ice protection system left and right outboard wing and horizontal stabilizer installations in accordance with Accomplishment Instructions B. and C. of Cessna Alert Service Letter SLAS550-30-05, dated December 17, 1985. D. Within 5 days after the required inspection, report any defects found to the Manager, Wichita Aircraft Certification Office, FAA, Central Region, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas 67209. E. The requirements of paragraphs A.1. and A.2., above, may be accomplished by the holder of a pilot certificate issued under Part 61 of the Federal Aviation Regulations (FAR) on any airplanes owned or operated by him. The person accomplishing these actions must make the appropriate aircraft maintenance record entry as prescribed by FAR 91.173. F. The requirements of paragraphs A.1. and A.2., above, are terminated upon the accomplishment of paragraphs B. and C. of this AD. G. Airplanes may be flown in accordance with FAR 21.197 and 21.199 to a location where the inspection/modification requirements of the AD can be accomplished. H. Alternate means of compliance with this AD which provides an acceptable level of safety may be used if approved by the Manager, Wichita Aircraft Certification Office, FAA, Central Region, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas 67209. All persons affectedby this directive who have not already received these documents from the manufacturer may obtain copies upon request to Cessna Aircraft Company, P.O. Box 7704, Wichita, Kansas 67277. These documents also may be examined at FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or FAA, Central Region, Wichita Aircraft Certification Office, FAA, Central Region, 1803 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas. This amendment becomes effective February 11, 1986, as to all persons, except those persons to whom it was made immediately effective by priority letter AD 85-25-10, issued December 17, 1985. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A22CE](https://openairdocs.org/tcds/A22CE): Textron Aviation Inc.; names 2 of 6 models: S550, 552 ## 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: 94 (94 by airframe model, 0 by engine model) - Makers: Cessna 94 Models with the most aircraft: - [Cessna S550](https://openairdocs.org/model/cessna-s550): 94 aircraft (airframe model) All 2 models: https://openairdocs.org/ad/85-25-10/models.md Every aircraft: https://openairdocs.org/ad/85-25-10/aircraft.md Its text cites no advisory circulars or STCs. --- 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.