04/26/21
Message Overview:
Message Name:
GROUND SPOILERS CHATTERING
| Identifier: | 276OBS002 |
| Effectivity: | AIRCRAFT 20501 - 20999 |
| System: | Hydraulics |
| Associated CAS: | None |
| System Description: | 27-63-00 |
| Schematic Diagram: | None |
| Wiring Diagram: | None |
Message Description:
The lack of hydraulic pressure and/or the hydraulic fluid temperature have a direct impact on the GSSVs that are causing the spoilers chattering. No troubleshooting action is required.
Possible Causes:
- Flight Guidance Computer (FGC) (A4-FGC)
- Pitch Servo
- Aileron Servo
- Yaw Damper (YD)
- Flight Control Panel (FCP)
- Lack of hydraulic pressure
- High hydraulic fluid temperature
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- AW300-27-0133 - Spoiler Panels Chattering
- AW300-29-0251 - Recent failures of the Engine Driven Pump (EDP)
Forum Articles/Infoservice/Newsletter: None
With the DCMPs providing the hydraulics, the user may hear or feel the spoilers chattering/shuddering when they are deployed due to insufficient fluid volume.
Also, the use of the Engine Driven Pump increase the hydraulic fluid temperature that have a impact on the GSSV internal springs. It is suggested to shutdown the EDP and park the aircraft in a colder area to let the hydraulic fluid cool down (less than 110°F) before trying any spoilers movements.
Quick Links:
None
Troubleshooting Recommendations:
- No troubleshooting action is required.