French Navy Feedback
June 2012 NH90 User Group LT Duclos
Aircraft behaviour
Embarkation Feedback
• Good behaviour with cross wind and
turbulences conditions
• Homologation granted on Horizon frigates,
LHD, CDG aircraft carrier
Mooring
• Step A
25 mn to secure the aircraft
AGE not suitable for ops
• Step B improvements must be applicable
on step A.
Folding
Embarkation Feedback
• Very poor reliability, 1 failure every 8 folding sequences
NOGO for embarkation
2010 2011 2012 Total
ATFA 1 1
ATLA 1 1
MRBFA 4 6 10
MRSLA 10 7 17
MRIA 3 1 4
FAC 3 1 4
• MRSLA : intermediate solution on a/c 06 – 07
• Cracks of spring support on fwd folding mechanism assembly
(5 occurrences), new design in study
• Hydraulic leak on swivel manifold seizure
Creation monthly working group
Embarkation Feedback
Traversing issue
• SAMAHE vs AHS (Autonomous Handling system)
Need to establish the Douglas Mantis – NH90 interoperability stability
envelop
Caïman configuration
• Deck lock and 5th pump
• “Step B mooring” on Step A aircrafts (flyable mooring rings)
• Step B Folding AGEs
Received and tested during CW25.
Will be embarqued during CW 28
Technicians skills
• Breaking cords
• Composite repair
• Environnemental control system
• ...
Embarkation Feedback
Maintenance at sea
Servicing
BFF and ALF usually done in the hangar
Tar on the deck
Maintenance
Safety Inspection : 3hours. On the deck or in the hangar
(including FCS Test)
With an anti corrosion treatment : 4 hours
Engine Removal and Installation
Embarkation Feedback
Maintenance at sea : Next steps
Jacking
Removal and installation of :
Front cowling
Bracket
Landing Gear
Scheduled 100FH operations
Technical Feedback
Maintainability
• About 20 MMH/FH (including scheduled & unscheduled
maintenance, servicing + 3 MMH/FH training)
• Scheduled maintenance duration have to be reduced for
deployment at sea (SI – 50FH – 100FH – 150FH & 30D)
Necessity to get the master schedule for maintenance
improvement (impact on human resources format)
Unavailability of 60%
• 45% for scheduled maintenance
• 15% for unscheduled maintenance
Electronic documentation maturity
• IPRF integration in IETP : ratio too low and too long
Short loops requested
Technical Feedback
Rescue Hoist
• Hoist cable jamming
• Hydraulic leak : motor valve (3 occurrences)
• Protection attachement
• Ball bearing hook : Rotation impossible, corrosion issue
(4 occurrences)
Cargo hook
• Unintended release in flight
Necessity to stow the rope attached to the hook in the cabin
while transiting for vertrep mission (no speed limitations)
• Load measurement instability
Technical Feedback
Floatation cover fraying
• More than 15 occurrences
• 17/06/2011, SR 1-6465495: « Industry works with its supplier on
the improvement of the cover assembly. Tolerance and
temporary repair are not conceivable for the moment »
• Spare parts a short term solution, design improvement
expected
Breaking cords rupture on floatation device
• New lacing behaviour required
on the all fleet
Technical Feedback
Wheel Brake Metering Valve (WBMV)
• Untimely jamming on WBMV
• FCC caution well-known and applied by aircrew
• Major failure MLG brakes on 06 during running landing
2011 2012 Total
WBMV 1 5 6
Heat Modulating Valve (HMV)
• Internal seal wear
• Mechanical command jamming
• Design and logistic issues
• Required for SAR operations
2011 2012 Total
HMV 5 5 10
Technical Feedback
Rotor Brake Power Module (RBPM)
• Weakness of the metallic clamp
• Crack of RBPM support
• Design issues
Center Locking Mechanism (CLM)
• Locking axis weakness : solved by new design
• Locking lever lost (4 occurrences) : tyraps solution not satisfactory
Impact on tow position during steering manoeuvre
Main Avionic Bay Fan
• Electrical motor issue
• Stator fixation issue
Design and logistic issues
2011 2012 Total
RBPM 3 6 9
CLM 11 5 16
MAB Fan 0 4 4
We need now to embark for maritime
operations : worldwide and long deployments.
Questions ?
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