03/03/21
Message Overview:
Message Description:
An open or short circuit or out of range of right engine Oil Level Probe is detected.
Possible Causes:
- Right Oil Level Probe
- Fuel Quantity Gauging Computer (FQCC) (A57)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
The oil level probes are connected to the Fuel Quantity Gauging Computer (FQGS). Oil gauging calculations are independent of fuel gauging. Oil level signals are transmitted to the Refuel/Defuel Panel (RDP) via ARINC 429 bus.
The 'NORMAL' and 'CHECK OIL' lights being ON at the same time on the RDP indicates a fault in the oil level probe or circuitry, or the measurements are out of tolerance for that side.
Quick Links:
| Quantity Check of the Engine Oil Tank (With the Sight Glass) | AMM 12-14-01-610-801 |
| Quantity Check of the Engine Oil Tank (With the Refuel/Defuel Control Panel) | AMM 12-14-01-610-802 |
| Removal of the Fuel Quantity Computer | AMM 28-41-01-000-801 |
| Installation of the Fuel Quantity Computer | AMM 28-41-01-400-801 |
| Calibration of the Remote Oil-Indicating System | AMM 79-31-00-820-801 |
| Removal of Oil Level Probe | AMM 79-30-13-000-801 |
| Installation of Oil Level Probe | AMM 79-30-13-400-801 |
| Intertechnique Oil Probe Cleaning | CMM 79-32-01-100-801-A01 |
| Honeywell Inspection of Oil Probe | LMM 72-60-01-200-005-A01 |
| Wiring - Maintenance Practices - ALL | SPM 20-12-00-02 |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 |
| Electrical Connectors - Maintenance Practices - ALL | SPM 20-20-00-02 |
Troubleshooting Recommendations:
- Remove the right Oil Level Probe.
- Do the visual inspection of the Oil Level Probe - Subtask 72-60-01-200-005-A01 as per Honeywell LMM 72-05-12 (Honeywell's website).
- Do the cleaning of the Oil Level Probe - Task 79-32-01-100-801-A01 as per Intertechnique CMM 79-32-01 (https://tpi.services.zodiacaerospace.com).
- Install the right Oil Level Probe and do the calibration of the Remote Oil-Indicating System. Is the fault still present?
- If NO, do close out.
- If YES, continue with next step.
- Swap the Oil Probes and do the calibration of the Remote Oil-Indicating System. Is the fault message still present?
- If NO, do close out.
- If YES, continue with next step.
- Do wiring check between the FQCC (A57) and the right Oil Level Probe for the following wiring:
From To Result Conn. A57AP1 - 23 W4P2 -2 Conn. A57AP1 - 33 W4P2 -3 Conn. A57AP1 - 34 W4P2 -1 - If the check is not satisfactory, repair/replace defective wire/harness.
- If the check is satisfactory, continue with next step.
- Replace Fuel Quantity Gauging Computer (A57).
- Do close out.