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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 2005 R44 Hook Failure

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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
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
evidence of overloading
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.
r22 spray tank design
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
excess capacity
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
proposed approval policy for agricultural spray systems
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
CAA Design Notices
  • Possible means of promulgating CAA Policy
  • ACU to issue as required
  • As proposed by DDHs
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