AFCAS Flashcards
How many flight control computers are there
3 FCC’s
Which FCC serves which side
Normally the FCC’s use onside data e.g. FCC 1 uses data from FMS 1 and FCC 2 uses data from FMS 2. FCC 1 serves FD 1 and AP 1, FCC 2 serves FD 2 and AP 2. Each FD provides display of steering commands at the onside PFD. The third FCC, (when installed), provides a fail operational AFCS capability in the most critical flight phases, which are take-off, go-around and landing
What is the effect of FCC failure
An FCC failure will cause the onside FD to fail. During manual flight with FD on, this condition is displayed to the pilot by: - Disappearance of the FD command bars - An amber FD flag at the PFD - An amber FAULT light in the onside FCC source select p/b - A level 1 alert at MFDS Steering guidance from the offside FD can be obtained (for display only) by depressing the onside FCC (FD) sources select p/b to ALTN. When AP 1 is engaged FCC 1 is in control. When AP 2 is engaged FCC 2 is in control. With both AP’s engaged (during take-off and auto-land) both FCC’s are in control. An FCC failure during flight with AP engaged will cause the onside AP to disconnect automatically. Engaging the offside AP remains possible. An FCC failure when both AP’s are engaged will cause both AP’s to disconnect automatically. Engaging the AP served by the operative FCC remains possible.
How many IRS’s are required for autopilot engagement
2 IRS’s
How can you disengage the autopilot
The AP can be manually disengaged by depressing the AP disconnect button at either control wheel. This action is accompanied by a single or double cavalry charge tone and flashing AP annunciation at the FMA. The flashing AP at the FMA can be cancelled by depressing the AP disconnect button again. Alternatively the AP disengages when the AP disconnect bar at the FMP is pulled or when one of the stabilizer trim switches on either control wheel is operated for more than 1.5 sec.
Automatic AP disengagement will occur in case of a system failure (e.g. the onside FCC) and is accompanied by a continuous cavalry charge tone and a flashing AP at the FMA. Both can be cancelled by the depressing either AP disconnect button
In HDG HOLD mode , how do you obtain a new heading
Rotate the HDG CONTROL knob to the desired heading and the pull the knob
How do you activate V/S mode
V/S is activated by rotating the V/S wheel
In ALT HLD mode how do you achieve a new altitude
Turning the ALT CONTROL knob to the desired Altitude and then either pulling the knob or pressing LVL CHNG push button
How do you activate LVL CHNG
LVL CHNG mode is activated by either pressing the push button or pulling the ALT select knob
What is the difference in aircraft reaction between V/S and LVL CHNG
V/S activation commands the aircraft to react fast and immediately, while LVL CHNG when activated takes into consideration pax comfort and does it slowly
In V/L mode when does VOR capture occur
VOR Capture will happen approx half dot
In approach mode when is the localiser captures
Localiser is captured at approximately 2 dots deflection
How can you set up a NAV capture
Upon Nav selection NAV mode Is armed , aircraft is still in HDG mode till the desired track is reached and NAV mode had captured
When cruising in PROF MODE , what must you do to initiate descent
When cruising in PROF the aircraft will not descend at the Top of Descent point in the flight plan unless the pilot lowers the FMP altitude to the clearance altitude.
In LAND mode, what is the difference between LAND and LAND2
In the LAND mode the aircraft will capture and track ILS localizer and glide slope and perform an automatic landing. Auto land capability is designated LAND 2. In aircraft equipped with three IRS’s, full auto land capability is designated LAND 3; reduced auto land capability is designated LAND 2.
