AD 86-01-01 R2 ACTIVE

86-01-01 R2 CESSNA: Amendment 39-5316 as amended by 39-5639. Applies to Model T303 airplanes (all serial numbers) certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent hazardous flight characteristics due to accumulations of ice at the unprotected junctures of the horizontal and vertical tail, accomplish the following:

(a) Prior to further flight on those airplanes approved for flight into icing conditions:

(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 ICING PROHIBITED."

(2) Revise the Pilot's Operating Handbook and FAA Approved Airplane Flight Manual Supplement "Known Icing Equipment," Section 2, Limitations, by deleting the first paragraph and replacing with the sentence: "Flight into known icing conditions is prohibited."

(3) Cover the airplane operating placard statement, "This airplane is approved for flight into icing conditions if the proper optional equipment is installed and operational" with opaque tape.

(4) Operate the airplane in accordance with the above limitations.

(b) Prior to further flight on all airplanes with or without approval for flight into icing conditions, revise the Pilot's Operating Handbook and FAA Approved Airplane Flight Manual, section 3, Emergency Procedures "Icing -Inadvertent Encounter" to add the following information in addition to the current published inadvertent icing encounter procedures:

(1) "A small amount (1/8" to 1/4" thickness) of ice on the unprotected junctures of the horizontal and vertical tail may disturb the airflow in such a way as to cause rudder/rudder pedal oscillations, pitch oscillations and possibly an uncommanded nose down pitch change requiring a higher than normal pull force to counteract. This phenomenon varies with certain combinations of airspeed, power setting, flap deflections, sideslips and type of icing conditions.

(2) If this condition is encountered the following action will reduce or eliminate the rudder oscillation and/or pitch change.

(i) Reducing airspeed (by either establishing a climb or reducing power) will reduce or eliminate the condition.

(ii) Reducing power will reduce or eliminate the condition at any given airspeed.

(iii) Reducing flap deflection will reduce or eliminate the condition at any given airspeed.

(iv) Reducing sideslip (improving coordination) will reduce the tendency for the condition to develop."

(c) The Pilot's Operating Handbook and FAA Approved Airplane Flight Manual revision requirements of paragraphs (a) (2) and (b) of this AD may be accomplished by inserting a copy of this AD in the Pilot's Operating Handbook and FAA Approved Airplane Flight Manual. For additional information see Cessna Owner Advisory SNL85-60A, dated December 23, 1985.

(d) The requirements of Paragraphs (a), (b), and (c) of this AD may be accomplished by the holder of a pilot certificate issued under Part 61 of the Federal Aviation Regulations (FARs) on any airplane owned or operated by him. The person accomplishing these actions must make the appropriate aircraft maintenance record entry as prescribed by FAR 91.173.

(e) The requirements of paragraphs (a) through (d) do not apply to airplanes equipped with Cessna Part Number SK3O3-39 (or SK303-39A) (called out in Cessna Service Bulletin MEB86-18) and associated POH/AFM revisions - either Cessna Part Number D1596R7- 13PH for S/N's T30300001 thru T30300175, Cessna Part Number D1602R3-13PH for S/N's T30300176 thru T30300247, or Cessna Part Number D1607R2-13PH for S/N's T30300258 thru T30300315 (called out in Cessna Service Bulletin MEB86-17).

(f) An equivalent method of compliance with this AD, if used, must be approved by the Manager, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid- Continent Airport, Wichita, Kansas 67209.

All persons affected by this directive may obtain copies of the document referred to herein upon request to the Cessna Aircraft Company, Customer Services, Post Office Box 1521, Wichita, Kansas 67201 or the FAA, Office of the Regional Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106.

Amendment 39-5316 became effective on May 28, 1986.

This amendment, 39-5639, becomes effective on July 13, 1987.