07/01/24
Message Overview:
Message Name:
FLAP RIGHT RESOLVER/ SFCU/ WRG
Message Code:
2750012STD
Associated CAS:
| Reporting LRU: | Slat/Flap Control Unit (SFCU) |
| System Description: | 27-52-00 - Flap System |
| Schematic Diagram: | 27-50-00 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wiring Diagram: | 27-50-02 [ Global Express ] [ G5000 ] [ Global XRS ] 27-50-04 [ Global Express ] [ G5000 ] [ Global XRS ] |
Message Description:
The Slat/Flap Control Unit (SFCU) does not receive input from the Right Wing Flap-Resolver or the input is not in the permitted range.
Possible Causes:
- Right Flap Resolver (MT72)
- Slat/Flap Control Unit (SFCU) 1 (A124)
- Slat/Flap Control Unit (SFCU) 2 (A95)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- AW 700-27-0373 - SFCU -17: “SLAT-FLAP HALFSPD” EICAS Nuisance Message
Forum Articles/Infoservice/Newsletter: None
Flight Operation Notifications Manual (FONM): None
NOTES:
- The resolvers are used by the SFCU for surface position acquisition.
Quick Links:
| Removal of the Slat/Flap Control Unit (SFCU) | AMM 27-51-05-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Slat/Flap Control Unit (SFCU) | AMM 27-51-05-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Removal of the Flap Resolvers | AMM 27-52-49-000-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Installation of the Flap Resolvers | AMM 27-52-49-400-801 [ Global Express ] [ G5000 ] [ Global XRS ] |
| Wire Repair | SPM 20-12-10 [ Global Express ] [ G5000 ] [ Global XRS ] |
Troubleshooting Recommendations:
- On the EMS CDU, select CTRL function and SLAT/FLAP RESET.
NOTE: Wait at least one minute after SFCU reset to allow self-test to run. - Cycle the flaps from IN/0 degrees to OUT/30 degrees.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Swap SFCU 2 with SFCU 1.
- If system checks are good, replace SFCU 2 and do close out.
- If fault remains, continue with next step.
- Move the SFCL to a different detent.
- If system checks are good, do close out.
- If fault remains, continue with next step.
NOTE: SFCU 1 is the left side (channel 1) controller. SFCU 2 is the right side (channel 2) controller.
- Perform a resistance check from the applicable resolver channel SFCU rack connector through the Flap resolver as follows:
From the SFCU 1, (resolver channel 1):
From To Expected Result Result A124AP1-81 A124AP1-82 140 to 220 ohms (Resolver Primary Coil R2-R1) A124AP1-87 A124AP1-88 13 to 24 ohms (Output Sine Coil ch.1) A124AP1-100 A124AP1-101 13 to 24 ohms (Output Cosine Coil ch.1) From the SFCU 2, (resolver channel 2):
From To Expected Result Result A95AP1-81 A95AP1-82 140 to 220 Ohms (Resolver Primary Coil R2-R1) A95AP1-87 A95AP1-88 13 to 24 Ohms (Output Sine Coil ch.1) A95AP1-100 A95AP1-101 13 to 24 ohms (Output Cosine Coil ch.1) - If resistance is within range, go to step 7.
- If fault remains, continue with next step.
- Perform wiring checks between the applicable SFCU rack connector and the Right Flap resolver connector.
From the SFCU 1 (resolver channel 1):
From To Expected Result Result MT72-1 A124AP1-82 Continuity MT72-2 A124AP1-81 Continuity MT72-6 A124AP1-88 Continuity MT72-5 A124AP1-87 Continuity MT72-3 A124AP1-101 Continuity MT72-4 A124AP1-100 Continuity From the SFCU 2, (resolver channel 2):
From To Expected Result Result MT72-7 A95AP1-82 Continuity MT72-8 A95AP1-81 Continuity MT72-12 A95AP1-88 Continuity MT72-11 A95AP1-87 Continuity MT72-9 A95AP1-101 Continuity MT72-10 A95AP1-100 Continuity - If wiring checks are not good, repair defective wiring as required and do close out.
- If wiring checks are good, continue with next step.
- Replace Right wing Flap resolver.
- Do close out.