Headquarters Fleet Air Arm
MRH90 and TopOwl
Navy Flight Trials
2010 AMMA/JHC
Symposium
DR Glenn PascoeDR Glenn Pascoe
MBBS...
Acknowledgment
LCDR Brad MacKay
Chief of Flight Test, AMAFTU
Headquarters Fleet Air Arm
Headquarters Fleet Air Arm
• TopOwl Helmet
•AMAFTU MRH90 FOCFT
Scope
MRH90
• NHIndustries NH90
– Tactical Transport Helicopter (TTH) vs NATO Frigate
Helicopter (NFH)
• Troop lift (embarked an...
Aircraft Maintenance and
Flight Trials Unit
• AMAFTU
– develop aircraft modifications
– maintenance and operational proced...
FOCFT Test – What is it?
Headquarters Fleet Air Arm
• Where the suitability of the ship /
aircraft combination is assessed...
TopOwl helmet mounted
sight and display system
• Valid engineering trade-offs:
– Good: See through capability, mass, CG,
–...
Headquarters Fleet Air Arm
Binocular Cues for Depth
perception
• Stereopsis - Angle of disparity
• Accommodation
• Converg...
Headquarters Fleet Air Arm
Hyperstereopsis
• An illusion created when each eye
views an image from sensors with an
interpu...
Headquarters Fleet Air Arm
Hyperstereopsis - Effects
• Absolute distance perception
– Objects appear closer
Right I² Tube
...
• Magnification of depth
– objects appear stretched, out of shape
Headquarters Fleet Air Arm
Hyperstereopsis - Effects
• Overlapping objects
– If enough light to see object unaided, NVD
image will be over-layed on real world
image
– May see ...
• Colour vision
– ADF allows for slightly colour
defective aircrew applicants (CP2)
– Optics of the TopOwl visor results
i...
TopOwl and deck operations
• Compensation for visual distortion is necessary
on initial exposure
– Adaptation to absolute ...
Results of Testing – TopOwl
• AS350 trial: approximately 60hrs
– Seated height appeared slightly lower than
normal
– Diffe...
Results of MRH90 Testing –
TopOwl
• MRH90 trial: approximately 10hrs
work-up and 10 hrs at sea
– Adaptation was Satisfacto...
Results of MRH90 Testing –
TopOwl
• Peripheral Cues
– Enhancing feature
– Allows peripheral scanning of a lit deck
Headqua...
FOCFT–Specifics of Flight Test
• Instrumentation
• Deck Modelling
– deck motion limits with/without lashings
• Shore based...
FOCFT – Specifics of
Interface Testing
• Deck interface & facilities examples
– Ranging & stowing aircraft
– Folding / spr...
Results of MRH90 FOCFT
Headquarters Fleet Air Arm
• 18 days at sea
• 19 Test Sorties
• 252 Deck Landings (172 Day / 80 Nig...
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Introduction of the mrh90 helicopter and top owl helmet for operational use by the royal australian navy pascoe

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Introduction of the mrh90 helicopter and top owl helmet for operational use by the royal australian navy pascoe

  1. 1. Headquarters Fleet Air Arm MRH90 and TopOwl Navy Flight Trials 2010 AMMA/JHC Symposium DR Glenn PascoeDR Glenn Pascoe MBBS, FRACGP, DAvMedMBBS, FRACGP, DAvMed Senior Medical Advisor Aviation MedicineSenior Medical Advisor Aviation Medicine –– NavyNavy (Wing Commander, RAAFSR)(Wing Commander, RAAFSR)
  2. 2. Acknowledgment LCDR Brad MacKay Chief of Flight Test, AMAFTU Headquarters Fleet Air Arm
  3. 3. Headquarters Fleet Air Arm • TopOwl Helmet •AMAFTU MRH90 FOCFT Scope
  4. 4. MRH90 • NHIndustries NH90 – Tactical Transport Helicopter (TTH) vs NATO Frigate Helicopter (NFH) • Troop lift (embarked and land based) • Fly by wire, retractable U/C, • Glass and carbon fibre composites • MTOW > SK50 • Rear loading ramp • Manual fold blades and tail pylon Headquarters Fleet Air Arm
  5. 5. Aircraft Maintenance and Flight Trials Unit • AMAFTU – develop aircraft modifications – maintenance and operational procedures – evaluate through flight test new and modified configurations, procedures and equipment – ADF’s centre of expertise for ship/helicopter First of Class Flight Trials (FOCFT), – Ship/Helicopter dynamic interface assessments (Embarked Flight Trials) Headquarters Fleet Air Arm
  6. 6. FOCFT Test – What is it? Headquarters Fleet Air Arm • Where the suitability of the ship / aircraft combination is assessed. • Ship just as much as aircraft focused • Outputs not only limited to SHOL – Maintenance & support facilities just as important • Testing to define safe operational capability of ship / aircraft combination
  7. 7. TopOwl helmet mounted sight and display system • Valid engineering trade-offs: – Good: See through capability, mass, CG, – Bad: Hyperstereopsis, lower performance Headquarters Fleet Air Arm
  8. 8. Headquarters Fleet Air Arm Binocular Cues for Depth perception • Stereopsis - Angle of disparity • Accommodation • Convergence
  9. 9. Headquarters Fleet Air Arm Hyperstereopsis • An illusion created when each eye views an image from sensors with an interpupillary distance greater than that of the human eyes
  10. 10. Headquarters Fleet Air Arm Hyperstereopsis - Effects • Absolute distance perception – Objects appear closer Right I² Tube Target point Real distance of object in the scene I² tube optical axes Left I² Tube D Normal IPD DD    Perceived distance of object in the scene
  11. 11. • Magnification of depth – objects appear stretched, out of shape Headquarters Fleet Air Arm Hyperstereopsis - Effects
  12. 12. • Overlapping objects – If enough light to see object unaided, NVD image will be over-layed on real world image – May see three objects instead of one Headquarters Fleet Air Arm Other TopOwl issues
  13. 13. • Colour vision – ADF allows for slightly colour defective aircrew applicants (CP2) – Optics of the TopOwl visor results in effectively looking through a “green blocker” when visor is down – Will CP2 pilots be safe? – Is reflected wavelength band narrow enough to not be a problem? – What about LED lights? Headquarters Fleet Air Arm Other TopOwl issues
  14. 14. TopOwl and deck operations • Compensation for visual distortion is necessary on initial exposure – Adaptation to absolute distance perception occurs fairly rapidly (5hrs initially then 10- 20mins for re-adaptation) – Adaptation to magnification of depth (‘arm stretch’ or slope perception) not complete • USMC concluded that use of Top Owl was unacceptable for deck operations – Different aircraft Headquarters Fleet Air Arm
  15. 15. Results of Testing – TopOwl • AS350 trial: approximately 60hrs – Seated height appeared slightly lower than normal – Different ‘apparent’ seated height unaided/aided: – Transition from aided to unaided flight Unsatisfactory Headquarters Fleet Air Arm
  16. 16. Results of MRH90 Testing – TopOwl • MRH90 trial: approximately 10hrs work-up and 10 hrs at sea – Adaptation was Satisfactory • Misjudged distance mitigated – Normal wheeled a/c landing technique • Establish ROD during quiescent period and land firmly – Height estimation assisted by RADALT – ACMN wearing ANVIS-9 NVD – Unfamiliar objects appear closer Headquarters Fleet Air Arm
  17. 17. Results of MRH90 Testing – TopOwl • Peripheral Cues – Enhancing feature – Allows peripheral scanning of a lit deck Headquarters Fleet Air Arm
  18. 18. FOCFT–Specifics of Flight Test • Instrumentation • Deck Modelling – deck motion limits with/without lashings • Shore based testing – Initial TopOwl NVD flight testing in AS350 – Low speed handling/ data collection – Simulated deck operations • Sea Testing – Interface Testing – SHOL development Headquarters Fleet Air Arm
  19. 19. FOCFT – Specifics of Interface Testing • Deck interface & facilities examples – Ranging & stowing aircraft – Folding / spreading – Maintenance & support facilities – Hanger suitability – Maintenance supervision – Aircrew briefing / mission planning – Weapons prep / loading aspects – Ship-based aviation facilities Headquarters Fleet Air Arm
  20. 20. Results of MRH90 FOCFT Headquarters Fleet Air Arm • 18 days at sea • 19 Test Sorties • 252 Deck Landings (172 Day / 80 Night) • 36 Utility operations • Overall, Very Large Envelopes (SHOLs) • 4 Major deficiencies identified

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