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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 2005R44 Hook Failure

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Spray Tank Mod Approvals

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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 2005R44 Hook Failure

  • Sept 2005 R44 Hook Cracking


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.


ZK-HWP Near Taumaranui


Failed Blade Root


Fracture Surface


Fatigue Origin From Bolt Hole


Fatigue Origin


R22 Spray Tank Design

Empty Weight880 lbs

  • Pilot170 lbs

  • 30 min Fuel23 lbs

  • Spray Gear90lbs

  • MAUW 1370lbs

    Available payload 207 lbs (max)

    • Volume of Water94 litres


Excess Capacity

  • Available payload94Litres

  • Typical Tank Capacity200 litres (100/side)

  • Survey of 17 R22 operators;

  • 3 OK, 11 overloaded, 3 wouldn’t say


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.


CAA Design Notices

  • Possible means of promulgating CAA Policy

  • ACU to issue as required

  • As proposed by DDHs


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