OVERSPEED.pptx njb hhg ooi jhb jb vcf tdr

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1. Aircraft Abnormal events overspeed By: 1- Abdulrahman Salim Al-Alawi 2- Quasi Salim Ambu-Saidi 3- Haitham Saif Al-Riyami 4- Amjad Al- saidi Class: 32 - MECH

2. Content:

3. DEFENITION OF OVERSPEED: Over speed condition when the aircraft fly with high speed beyond the designed speed limits. Which can cause remarkable damage for the aircraft components and systems.

4. Overspeed classifications: 1. Airframe and structures overspeed: Aircraft speed must be in the designed speed ranges and unacceptable to exceed the speed limits: • Ground overspeed • Airspeed or Inflight Overspeed • Overspeed for a particular flight condition

5. Overspeed classifications: 2. Engine overspeed: When the engine turning or forced to turn beyond the turning limits.

6. Safety and security risks associated with over-seed maintenance of aircraft include: Environmental factors. Aircraft altitude. Scratches or dents, which can impact the aerodynamics and structural integrity of the aircraft. Over-seed maintenance can involve the removal of sensitive information from the aircraft. Unqualified personnel to perform over-seed maintenance.

7. Risk mitigation techniques:

8. Overspeed inspection

9. Overspeed inspection Fuselage: Windshield and windows Hinged doors, latches inspection Fairings and panels Stabilizers: Skins, hinges and moveable surface Wings and flaps

10. Overspeed inspection

11. Super puma rotor overspeed There are two types of rotors, the main rotor and the tail rotor, so when overspeed occurs, they must be inspected. Applicable documents Work on aircraft inspecting for this event requires some documents, which are: Maintenance manual (chapter 5) Work cards: Inspection and actions to be taken Rotor head and shaft assy: Check Inspection and steps to be taken Check flexion of main blades vertically and horizontally, following an incident Tail gearbox: Check Eng 39 Eng 120 Figure (2)Tail rotor( Domke , 2005) Figure (1)Main rotor( Domke , 2003)

12. Action to be taken Aircraft rotor inspection cases classified according to the revolutions per minute ( RPM ) of the main rotor. Main rotor RPM from 265 to 310: Flight envelope Main rotor RPM from 310 to 320: No action to be taken   Main rotor RPM from 320 to 345: Main rotor head to be inspected visually according to work card 62.35.00.601 Tail rotor head to be inspected visually according to work card 64.20.00.601 Tail rotor blades to be checked detailly according to work card 64.10.00.601 Figure (3)Tail rotor head (MTC,2014)

13. Main rotor RPM from 345 to 350: Main rotor head to be inspected visually and checked directionally of: Spindle yoke Sleeve threads If they damaged, they should be scrapped . Main rotor blades to be checked detailly according to work card 62.10.00.603 and the deformation on the drag axis to be measured according to work card 62.10.00.604 . Tail rotor head to be inspected visual according to work card 64.20.00.601. Tail rotor blades to be returned to the works for examination  Figure (3)Axial(MTC,2014)

14. Main rotor RPM from 350 to 360: Main rotor head to be: checked dimensionally and detected for crak on: Flapping hinge Adapter yoke Bolts attaching mast to flange Scrapped if defect found on: Spindle Sleeve Bearing stack  Main rotor blades to be checked detailly according to work card 62.10.00.603 and the deformation on the drag axis to be measured according to work card 62.10.00.604.  Tail rotor head to be returned for overhaul. Tail rotor blades to be returned to the works for examination. Figure (4)Main rotor (MTC,2014)

15. Main rotor RPM from 360 to 380:   Main rotor head to be scrapped.   Main rotor blades to be returned to works for examination.   Tail rotor head to be returned for overhaul.   Tail rotor blades to be returned to the works for examination.   Main rotor RPM from 380 and above: Main rotor head to be scrapped, and m ain rotor blades to be returned to works for examination.   Tail rotor head TRH and blades to be scrapped.   Equipment: All equipment required for the inspection are mentioned in the work cards

16. Conclusion: To conclude, Proper inspection after overspeed condition ensures the aircraft serviceability. Correct procedure to be done after the pilot report overspeed condition, including the documentation and inspection steps as mentioned in the AMM.

17. Reference: MTC. (2014). Super Puma Aircraft Maintenance Manual.” lifting and shoring”. (Chapter 05). Unpublished Domke , B. (2003) Aircraft in detail - Main rotor head close-ups , Aircraft in detail - rotorhead close-ups . Available at: https://b-domke.de/AviationImages/Rotorhead/0800.html (Accessed: January 29, 2023). Domke , B. (2005) Aircraft in detail - Tail rotor head close-ups , Aircraft in detail - rotorhead close-ups . Available at: https://b-domke.de/AviationImages/Rotorhead/0801.html (Accessed: January 29, 2023). MTCA4013 : LO 4 - Aircraft Abnormal events. Slides 19-26. 2019. Unpublished.