Service Bulletin SB-21| Name | Revision | Lang | Subject | Date |
|---|
| SB21-2 | | en | CONDITIONING - PNEUMATIC ACTUATOR AND VALVE CHANGE | 01/28/1972 |
| SB21-5 | | en | AIR CONDITIONING - INSTALLATION OF RESISTORS ON DEFOG FAN | 09/07/1972 |
| SB21-6 | | en | AIR CONDITIONING - ADDITION OF INSULATION AT CABIN TEMPERATURE SENSOR | 09/07/1972 |
| SB21-7 | | en | Mandatory AIR CONDITIONING ~ WINDSHIELD RAIN REMOVAL IMPROVEMENT | 11/08/1972 |
| SB21-8 | 4 | en | AIR CONDITIONING - SUPPLEMENTAL FLIGHT COMPARTMENT VENTILATION INSTALLATION | 01/27/1978 |
| SB21-9 | 8 | en | | 04/12/1991 |
| SB21-10 | 2 | en | CABIN TEMPERATURE SENSOR AND CONTROLLER SPARES REPLACEMENT | 03/20/1981 |
| SB21-12 | | en | AIR CONDITIONING - INSTRUMENT PANEL COOLING | 03/15/1974 |
| SB 21-13 | | en | AIR CONDITIONING - DEFOG BLOWER MODIFICATION | 10/24/1975 |
| SB21-16 | | en | | 03/11/1983 |
| SB21-18 | | en | AIR CONDITIONING - FREON AIR CONDITIONING LOW PRESSURE SWITCH DISABLEMENT | 04/06/1984 |
| SB21-19 | | en | AIR CONDITIONING - NOSE GEAR DOORS MODIFICATION | 06/15/1984 |
