AD 86-24-11

86-24-11 FAIRCHILD AIRCRAFT CORPORATION: Amendment 39-5481. Applies to Fairchild Aircraft Corporation Models SA 226-T, SA 226-T(B), SA 226-AT, and SA 226-TC (all serial numbers) airplanes certificated in any category.

Compliance: Required within the next 50 hours time-in-service after the effective date of this AD, unless already accomplished.

To prevent engine flameout when in or departing an icing environment, accomplish the following:

(a) Revise the airplane Pilot's Operating Handbook and Airplane Flight Manual (POH/AFM) by inserting Appendix 1 of this AD in the "LIMITATIONS" section of the POH/AFM. Appendix 1 procedures supersede any other POH/AFM procedures which may be contradictory.

NOTE: Automatic-relite ignition is a system which automatically energizes engine ignition without pilot action when engine RPM or torque decays below a specified level, and de-energizes engine ignition when RM or torque exceeds the specified level. It is not synonymouswith CONTINUOUS IGNITION.

(b) The requirements of paragraph (a) of this AD may be accomplished by the holder of a pilot certificate issued under Part 61 of the Federal Aviation Regulations 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.

(c) Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished.

(d) An equivalent method of compliance with this AD, if used, must be approved by contacting the Manager, Airplane Certification Branch, ASW-150, Rotorcraft Certification Directorate, P.O. Box 1689, Fort Worth, Texas 76101; Telephone (817) 877-5150.

All persons affected by this directive may obtain copies of the document referred to herein upon request to GTEC, P.O. Box 5217, Phoenix, Arizona 85010; Telephone (602) 231-1000; or Fairchild Aircraft Corporation, P.O. Box 32486, San Antonio, Texas 78284; Telephone (512) 824-9421; or FAA, Office of the Regional Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106.

This amendment becomes effective on December 15, 1986.

APPENDIX 1 Supplement to the POH/AFM Fairchild Models SA 226-T, SA 226-T(B) SA 226-AT, and SA 226-TC Airplanes

"The IGNITION MODE switches shall be selected to AUTO/CONT during all operations in actual or potential icing conditions described herein:

(1) During takeoff and climb out in actual or potential icing conditions.

*(2) When ice is visible on, or shedding from propeller(s), spinner(s), or leading edge(s).

*(3) Before selecting ANTI-ICE, when ice has accumulated.

(4) Immediately, any time engine flameout occurs as a possible result of ice ingestion.

(5) During approach and landing while in or shortly following flight in actual or potential icing conditions.

*Note: If icing conditions are entered in flight without the engine anti-icing system having been selected, switch one ENGINE system to an ENGINE HEAT position. If the engine runs satisfactorily, switch the second ENGINE system to an ENGINE HEAT position and check that the second engine continues to run satisfactorily.

For the purpose of this supplement, the following definition applies:

Potential icing conditions in precipitation or visible moisture meteorological conditions:

(1) Begin when the OAT is plus 5 degrees C (plus 41 degrees F) or colder, and

(2) End when the OAT is plus 10 degrees C (plus 50 degrees F) or warmer."

The procedures and conditions described in this appendix supersede any other POH/AFM procedures and conditions which may be contradictory.