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To sum up, we would have to
lose 5 flight computers (MFC 1, 2
and 3 and 2 SFCs) in order to lose
our FBW ability. This level of
redundancy is greater than that
required for safety—in fact, it may
permit dispatch with single FC failure
once the MEL is finalized and
approved.
Certain system failures (hydraulic,
electrical, etc) will cause the FCs to
degrade from normal control law
first to alternate law and then to
direct law, in which sidestick position
corresponds directly with control
position. SFCs always operate
in direct law, with the pilot using
the center pedestal switches for
pitch trim.
If all FCs are lost the 7X will be
flown in manual reversion, with
electric pitch trim and rudder.
While the upper main rudder of the
7X is hydraulically actuated, the
lower rudder is electrically actuated
with high-speed electric motors.
Manual reversion employs this
lower rudder and is thus 100%
electric.
Electrical power in the 7X is thus
necessary both for FBW and for its
backup. At the Dassault equipment
facility at Saint-Cloud I took the opportunity
to fly another 7X simulator,
this one linked to the 7X “global
test bench” (GTB).
The GTB has complete electrical,
hydraulic and flight control systems
working together. The Falcon 7X
has 3 engine-driven electrical generators
and 2 permanent magnet
generators (PMGs), which are driven
by engines 1 and 2.
The 3 engine-driven generators
power MFC 1 and 2 and SFC 1 and
2 through the left and right essential
busses. These will be backed up
by the emergency RAT generator
and by the aircraft’s 2 batteries.
MFC 3 and SFC 3 are each powered
by one of the 2 PMGs.
Dassault has built significant
redundancy into the 7X’s electrical
system—in all there are 6 generators
and 2 batteries.
PROFESSIONAL PILOT / September 2004 97
Don Witt is a former
Airbus A320 captain
with United. He has
also worked as a
meteorologist, CFI,
charter/ corporate
pilot and FSI Learjet
instructor. He flew
McDonnell F4s in Vietnam.
Falcon 7X sidestick has 4 switches, including
a sidestick priority function to allow one
pilot to take control if both pilots are trying
to fly at once. As trim is entirely automatic,
the sidestick has no trim switch.
The 7X’s center pedestal has pitch trim
switches for electrically actuating the stabilizer
if FCs revert to direct law or when operating
in manual reversion. In normal flight
(FCs in normal law) pitch trim is automatic.
F6177
SERVICE INFORMATION LETTER (S.I.L.)
2005, April 12th SIL N°04.99 – Rev.2 1
S.I.L. N° 4.99
MAINTENANCE INTERVAL and EXTENSION PROCEDURE
FOR BATTERIES P/N 405CH and 505CH
REASON
This SIL presents the interval between maintenance and then the conditions, which have
to be respected to allow the increase of the interval between maintenance.
MAINTENANCE INTERVAL DESCRIPTION
Battery P/N 405CH is on board of the Airbus A330 and A340 aircraft.
Battery P/N 505CH is on board of the Airbus A340-500/600 aircraft.
These two batteries have a similar interval between maintenance.
At entry into service of Airbus A330, A340 and A340-500/600 aircraft, the initial interval
between maintenance was:
- Regular check (includes a periodical check) : every 2000 operating hours
- General overhaul : yearly
The first maintenance interval extension, increasing the interval between regular checks to
3000 operating hours, has been authorized following analysis of all data collected from
operators on their fleets.
In the Check chapter of their Component Maintenance Manual, the following maintenance
operations are indicated : Interval between maintenance.
- Regular check (includes a periodical check) : every 3000 operating hours
- General overhaul : yearly
NOTE: according to aircraft operation, the ratio between operating hours (aircraft
Power ON) and flying hours is generally in the 1.2 to 1.8 range for A330 and A340 aircraft
and equal to 1.2 for A340-500/600 aircraft.
MAINTENANCE INTERVAL EXTENSION PROCEDURE
The Airbus operator, which uses the battery P/N 405CH and/or the battery P/N 505CH
may be authorized to extend the interval between regular check beyond 3000 operating
hours if the following procedure and conditions are respected :
1) During a period of one full year the operator must collect on all the requested
data contained in the two attached forms : FORM1 and FORM2.
a) FORM1 : fleet data, global data on fleet (one form per month to be filled)
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