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Spray Tank Mod Approvals

Spray Tank Mod Approvals. Design Delegation Holders Seminar Oct 2005 by Jack Stanton Team Leader Continuing Airworthiness Civil Aviation Authority. Recent Ag Helo Accidents. ZK-HSF UH-1 23 April 04 ZK-HWP R22 Nov 2004 Incidents: June 2005 R44 Hook Failure

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Spray Tank Mod Approvals

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  1. Spray Tank Mod Approvals Design Delegation Holders Seminar Oct 2005 by Jack Stanton Team Leader Continuing Airworthiness Civil Aviation Authority

  2. Recent Ag Helo Accidents • ZK-HSF UH-1 23 April 04 • ZK-HWP R22 Nov 2004 • Incidents: • June 2005 R44 Hook Failure • Sept 2005 R44 Hook Cracking

  3. Evidence of Overloading • ZK-HSF UH-1 on Spraying operations, accident investigation revealed Tension Torsion strap failed due previous main rotor overspeed. • ZK-HWP R22 Main Rotor Blade failed in Fatigue at 700hrs TSN, Nill corrosion. Repeated operation beyond rated limit.

  4. ZK-HWP Near Taumaranui

  5. Failed Blade Root

  6. Fracture Surface

  7. Fatigue Origin From Bolt Hole

  8. Fatigue Origin

  9. R22 Spray Tank Design Empty Weight 880 lbs • Pilot 170 lbs • 30 min Fuel 23 lbs • Spray Gear 90lbs • MAUW 1370 lbs Available payload 207 lbs (max) • Volume of Water 94 litres

  10. Excess Capacity • Available payload 94 Litres • Typical Tank Capacity 200 litres (100/side) • Survey of 17 R22 operators; • 3 OK, 11 overloaded, 3 wouldn’t say

  11. Proposed Approval Policy for Agricultural Spray Systems. • The tank capacity is not to exceed 105% of the volume of water that could be carried within MAUW and C of G limits for the aircraft in condition ready for flight with fuel reserves meeting CAR 91.305 and crew onboard.

  12. CAA Design Notices • Possible means of promulgating CAA Policy • ACU to issue as required • As proposed by DDHs

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