10/06/23
Message Overview:
Message Name:
PACK TEMP HIGH
Message Code:
B3-007409
Associated CAS:
| Reporting LRU: | Integrated Air System Controller (IAS) 1A |
| System Description: | 21-61-00 - Temperature Control and Indication |
| Schematic Diagram: | 21-61-00-101 - Temperature Control and Indication |
| Wiring Diagram: | 21-52-17-1 - Sheet 1 - Compressor Discharge Temperature-Sensor - ALL |
Message Description:
The compressor discharge temperature of the pack has been detected over its maximum allowed limit of 240°C. Run both Integrated Air System Controller (IASC) #1 power-up tests.
Possible Causes:
- RAM Air Duct
- Precooler
- Precooler Heat Exchanger
- Pack Overheat
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- AW300-21-0413 - Air Cycle Machine (ACM) - Investigation of Failures Causing Smoke/Smell Events
Forum Articles/Infoservice/Newsletter: None
- SIL LS3471-21-01 - Failure of Air Cycle Machine PN 3471A020000 potentially causing smoke/smell event
Fault Confirmation Procedure:
- Message# = 1
- Fault Logged = AIR, TAXI
- Status = OVERHEAT
- Message Type = Fault Message
- {Term Definitions}
- IAS1A-59 XX 353 00 EXCT XXXX-XXXT XXXX-XXXX XXXX-XXXX 353A: 25; PACK OVERHEAT
- IAS2A-64 XX 353 10 EXCT XXXX-XXXT XXXX-XXXX XXXX-XXXX 353A: 25; PACK OVERHEAT
Quick Links:
| Removal of the Covers and Plugs | AMM 10-12-00-020-802 |
| Standard Aircraft Configuration for Maintenance | AMM 12-00-00-867-803 |
| Operational Test of the Cabin Pressure Control System | AMM 21-31-00-710-801 |
| Component Location | AMM 21-31-00-992-801 |
| Removal of the Integrated Air System (IAS) Controller | AMM 21-31-01-000-801 |
| Installation of the Integrated Air System (IAS) Controller | AMM 21-31-01-400-801 |
| Removal of the Outflow Valve | AMM 21-31-05-000-801 |
| General Visual Inspection of the Outflow Valve | AMM 21-31-05-210-801 |
| Installation of the Outflow Valve | AMM 21-31-05-400-801 |
| Removal of the Air Cycle Machine | AMM 21-52-13-000-801 |
| Installation of the Air Cycle Machine | AMM 21-52-13-400-801 |
| Removal of the Compressor Discharge Temperature-Sensor | AMM 21-52-17-000-801 |
| Installation of the Compressor Discharge Temperature-Sensor | AMM 21-52-17-400-801 |
| Removal of the Pack Discharge Temperature-Sensor | AMM 21-52-37-000-801 |
| Installation of the Pack Discharge Temperature-Sensor | AMM 21-52-37-400-801 |
| Removal of the Ram-Air Intake Upper-Duct | AMM 21-53-13-000-801 |
| General Visual Inspection of the Ram-Air Inlet Ducting | AMM 21-53-13-210-801 |
| Installation of the Ram-Air Intake Upper-Duct | AMM 21-53-13-400-801 |
| Removal of the Ram-Air Intake Lower-Duct | AMM 21-53-17-000-801 |
| Installation of the Ram-Air Intake Lower-Duct | AMM 21-53-17-400-801 |
| Connect Electrical Power to the Aircraft | AMM 24-00-00-861-801 |
| Remove the Electrical Power from the Aircraft | AMM 24-00-00-861-802 |
| Electrical/Electronic Safety Precautions | AMM 24-00-00-910-801 |
| Electrostatic-Discharge Safety Precautions | AMM 24-00-00-910-802 |
| Removal of the Lower Precooler Inlet-Duct | AMM 36-11-45-000-801 |
| Installation of the Lower Precooler Inlet-Duct | AMM 36-11-45-400-801 |
| Removal of the Upper Precooler Inlet-Duct | AMM 36-11-47-000-801 |
| Installation of the Upper Precooler Inlet-Duct | AMM 36-11-47-400-801 |
Troubleshooting Recommendations:
- The compressor discharge temperature of the pack has been detected over its maximum allowed limit of 240°C. Run both IASC #1 power-up tests. If no problem is detected, clean RAM air ducting, Precooler and Precooler Heat Exchanger.