06/25/22
Message Overview:
Message Name:
INLET PRESSURE SENSOR [SIG OUT LO]
Message Code:
4960190APU
Associated CAS:
| Reporting LRU: | Full-Authority Digital Engine-Controller (FADEC) |
| System Description: | 49-60-00 - Engine Controls |
| Schematic Diagram: | [ Global Express ] [ G5000 ] [ Global XRS ] - 49-61-00-101 - APU Automatic Control System |
| Wiring Diagram: | [ Global Express ] [ G5000 ] [ Global XRS ] - 49-12-01-02 APU Electrical Harness [ Global Express ] [ G5000 ] [ Global XRS ] - 49-61-00-01 APU Automatic Control System - 9002-9129 [ Global Express ] [ G5000 ] [ Global XRS ] - 49-61-00-02 APU Automatic Control System |
Message Description:
Inlet Pressure signal is less than 7.0 PSIA when Weight-On-Wheels is true or less than 1.0 PSIA when Weight-On-Wheels is not true.
Possible Causes:
- Pack Inlet Pressure Sensor 1 (MT1)
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Flight Operation Notifications Manual (FONM): None
Quick Links:
| APU Safety Precautions | AMM 49-00-00-910-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Engine Branched Wiring-Harness | AMM 49-12-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Engine Branched Wiring-Harness | AMM 49-12-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Full-Authority Digital Engine-Controller (FADEC) | AMM 49-61-01-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Full-Authority Digital Engine-Controller (FADEC) | AMM 49-61-01-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Inlet Pressure Sensor | AMM 49-61-13-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Inlet Pressure Sensor | AMM 49-61-13-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- Visually inspect the engine branched wiring-harness for bare wiring, kinks, worn areas and other damage.
- If harness checks are good, go to step 3.
- If there is bare wiring, kinks, worn areas or other damage, continue with next step.
- Replace or repair Engine branched wiring-harness. Is the fault still present?
- If YES, continue with next step.
- If NO, do the close out.
- Examine Inlet Pressure Sensor receptacle MT1 for contamination and damage.
- If Inlet Pressure Sensor receptacle MT1 is contaminated or damaged, rectify/replace the Inlet Pressure Sensor (P2) and do the close out.
- If no damage/contamination is found, continue withj next step.
- On Inlet Pressure Sensor receptacle MT1, perform a continuity check as follows:
From To Expected Result Result MT1P1-A MT1P1-B Between 1000 Ω and 4000 Ω MT1P1-C MT1P1-D Between 500 Ω and 2000 Ω MT1P1-A Ground Open MT1P1-B Ground Open MT1P1-C Ground Open MT1P1-D Ground Open - If results are correct, continue with next step.
- If results are not correct, replace the Inlet Pressure Sensor and do the close out.
- Perform wiring checks between P802 (APU) and (MT1P1) inlet pressure sensor (P2)
- If wiring defects are found, repair defective wiring as required and do the close out.
- If no defects are found, continue with next step.
From To Result P802-19 MT1P1-A (+ PWR) P802-20 MT1P1-B (- PWR) P802-43 MT1P1-C (+ SIG) P802-44 MT1P1-D (- SIG) - Perform wiring checks between J802 (AC wiring harness) and A108AP1 (APU FADEC).
- If wiring checks are not good, repair associated wiring and do close out.
- If wiring checks are good, continue with next step.
From To Result J802-19 A108AP1-D3 (+ PWR) J802-20 A108AP1-E3 (- PWR) J802-43 A108AP1-A3 (+ SIG) J802-44 A108AP1-B3 (- SIG) - Replace the APU FADEC.
- Do the close out.