EMERGENCY EXTENSION
Emergency extension permits lowering of the LG in case the normal
operation is ineffective.
Emergency extension of the landing gear is controlled using the EMER
DOWN pushbutton which acts on the emergency valve of the LGCV and
utilities:
• hydraulic power from system no.1
• electrical power from ESS BUS 2
The position of the Landing Gear Control Lever (UP or DOWN) is not
relevant for emergency extension.
Emergency extension occurs in two phases.
PHASE 1
If, after selecting the LGCL to DOWN, any LG position indicators remain
blank or amber and normal landing gear extension is confirmed to be
ineffective, the emergency extension is to be carried out by lifting the guard
and pressing the EMER DOWN pushbutton switch which illuminates (amber
ON legend).
The emergency valve solenoid is energized and pressure from hydraulic
system no.1 is delivered to the MLG SA to elongate (extend) the MLG and
the NLG RA.
The NOSE, LH and RH amber lights illuminate.
The emergency valve position microswitch provides the advisory LDG EMER
DOWN on the CAS window of the MFD.