CIRRUS SR2X SB 2X Service Bulletin. Issued: February 27, SNS SUBJECT: TEMPERATURE CONTROL - Cabin Air Coupler Actuator Rigging

Transcription

1 CIRRUS SR2X Service Bulletin Number: Issued: February 27, 2012 SNS SUBJECT: TEMPERATURE CONTROL - Cabin Air Coupler Actuator Rigging 1. COMPLIANCE Recommended, On Condition: Accomplish this Service Bulletin on condition of cabin air coupler actuator rigging functionality. An improperly rigged cabin air coupler actuator is indicated by overly warm cabin heat in cold weather and poor performance of the air conditioning system in hot weather. 2. EFFECTIVITY SR20 Serials , thru SR22 Serials , , thru , , , thru SR22T Serials 22T-0001 thru 22T-0284, 22T-0288 thru 22T APPROVAL FAA approval has been obtained on all technical data in this Service Bulletin that affects type design. 4. PURPOSE Cirrus Design has recently discovered a condition where on some affected airplanes, incorrect cabin air coupler actuator rigging at the factory results in a condition where the hot air valve does not close fully. This condition will cause overly warm cabin heat in cold weather and poor performance of the air conditioning system in hot weather. To correct this condition, this Service Bulletin provides cabin air coupler actuator rigging instructions. 5. DESCRIPTION This Service Bulletin provides instructions for rigging the cabin air coupler actuator. 6. WARRANTY INFORMATION Operators who have complied with this On Condition Service Bulletin should contact Cirrus Aircraft Customer Service at Option 3 for warranty reimbursement. 7. MANPOWER REQUIREMENTS 1.0 manhour. 8. OTHER PUBLICATIONS AFFECTED SR20 Airplane Maintenance Manual (p/n ) SR22/22T Airplane Maintenance Manual (p/n ) 9. WEIGHT AND BALANCE N/A Page 1

2 CIRRUS S ERVICE BULLETIN MODEL SR2X SERIES 10. MATERIAL INFORMATION N/A 11. ACCOMPLISHMENT INSTRUCTIONS A. Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Wire Cutter - Any Source Trim linkage wire. B. Pull STARTER RELAY and FUEL PUMP RELAY circuit breakers. C. Connect 28 ±1 VDC external power to external power receptacle. D. Set BAT 1 switch to ON position. E. Remove engine cowling. (Refer to AMM 71-10) F. Remove clamps securing fresh air duct and heat exchanger duct to air mixing chamber. Disconnect ducts. (Refer to AMM 21-40) G. Procedure - Cabin Air Coupler Actuator Rigging (See Figure 1) (1) Loosen wire stop on linkage wire. (2) Set temperature control knob to full cold. (3) Position heat control arm on air mixing chamber so that hot air valve is fully closed. (4) Tighten wire stop on linkage wire. (5) Rotate temperature control knob from full cold to full hot. (Refer to AMM 21-60) (6) Verify fresh air valve is fully closed. (7) Cycle temperature control knob a few times to verify hot and fresh air valves open/close fully without binding. (Refer to AMM 21-60) Note: If fresh air valve does not close fully, verify aircraft batteries are sufficiently charged (supplying 20 volts minimum). If charge is sufficient, repeat Procedure - Cabin Air Coupler Actuator Rigging to reposition linkage wire as required until both valves close fully. (8) Verify approximately 0.5 inch (1.3 cm) of wire extends beyond wire stop. Use wire cutter to remove any excess wire length. H. Position fresh air duct and heat exchanger duct to air mixing chamber, and secure with clamps. (Refer to AMM 21-40) I. Install engine cowling. (Refer to AMM 71-10) J. Set BAT 1 switch to OFF position. K. Disconnect 28 ±1 VDC external power from external power receptacle. L. Reset STARTER RELAY and FUEL PUMP RELAY circuit breakers. M. Complete airplane records by noting compliance with in Aircraft Logbook. Page 2

3 CIRRUS S ERVICE BULLETIN MODEL SR2X SERIES 0.5 inch (1.3 cm) STOP LINKAGE TO CABIN AIR COUPLER ACTUATOR HEAT CONTROL ARM AIR MIXING CHAMBER HOT AIR VALVE FRESH AIR VALVE STOP LINKAGE TO CABIN AIR COUPLER ACTUATOR CLOSED HOT AIR VALVE (FULL COLD) HEAT CONTROL ARM HOT AIR VALVE FRESH AIR VALVE AIR MIXING CHAMBER OPEN HOT AIR VALVE (FULL HOT) NOTE Position heat control arm on air mixing chamber so that hot air valve is fully closed. Cycle temperature control knob a few times to verify hot and fresh air valves open/close fully without binding. Verify approximately 0.5 inch (1.3 cm) of wire extends beyond wire stop. Use wire cutter to remove any excess wire length. Figure 1 Cabin Air Coupler Actuator Rigging SR2_SB21_1433 Page 3

4 CIRRUS SR2X Service Bulletin Number: Issued: February 27, 2012 Service Loop Evaluation Form SNS SUBJECT: TEMPERATURE CONTROL - Cabin Air Coupler Actuator Rigging Use this form to submit a Publications Change Request to our Engineering Department and/or to tell us what you think of the quality of this publication. We will use the data you provide us to improve the quality of our technical publications. Contact Information: Organization: Today s Date: Address: Telephone No.: City/ST/Zip: Fax No: Prepared By: Title: Location of Publication Change Request: Chapter Number: Section Number: Figure No (IPC or WM only): Page Number: Page Date: Illustration Number (if applicable): Please consider the following suggestions for change: Evaluation: Please rate the quality of this publication. (good) (poor) Please rate the quality of the illustrations. (good) (poor) Is this publication easy to understand? (good) (poor) Is this publication easy to use? (good) (poor) Are the Material and Accomplishment Instructions accurate? (good) (poor) Is the Manpower estimate accurate? (good) (poor) Give the completed evaluation form to your Cirrus Field Service Representative or send this form to Cirrus Design Corporation: Manager - Technical Publications 4515 Taylor Circle Duluth, MN 55811

5 Cirrus Design Corp 4515 Taylor Circle Duluth, MN STAMP CIRRUS DESIGN CORPORATION 4515 TAYLOR CIRCLE DULUTH, MN