A320 LAND & RWY FMA's
Thread Starter
Join Date: Mar 2013
Location: 36,000'
Posts: 176
Likes: 0
Received 0 Likes
on
0 Posts
A320 LAND & RWY FMA's
FINAL FMA
One of the engagement conditions state:
- What is the significance of the “FINAL FMA” ?
- What I am trying to ask is why couldn’t the FMA go from LOC / GS to “Flare” directly?
- Can it appear during NPA?
One of the engagement conditions state:
- The aircraft heading is within 20 ° of the ILS related course. When will this condition be applicable ?
Join Date: Oct 2015
Location: 43N
Posts: 264
Likes: 0
Received 0 Likes
on
0 Posts
The FINAL FMA in blue - a MAN/MAN approach has been selected in the MCDU and the pitch is armed to maintain the final descent profile. (You won’t see a FINAL FMA when flying an ILS approach.) Other FMA’s you will see on a MAN/MAN approach are APP NAV (blue - lateral guidance armed) APP NAV (green - lateral guidance engaged) and FINAL APP (green - vertical and lateral guidance engaged) Some other FMA combinations you may see are pictured as well.
RWY FMA (green) is for T/O. If takeoff runway has a localizer it is autotuned. You’ll see a ground roll guidance bar on your PFD during the takeoff roll until 30’ AGL. (And you know I just read somewhere when that appears when taking the runway but now I can’t find it - so I’ll go with your 20 degrees)
RWY FMA (green) is for T/O. If takeoff runway has a localizer it is autotuned. You’ll see a ground roll guidance bar on your PFD during the takeoff roll until 30’ AGL. (And you know I just read somewhere when that appears when taking the runway but now I can’t find it - so I’ll go with your 20 degrees)
Last edited by CaptainMongo; 2nd May 2021 at 12:39. Reason: Other combinations image
Thread Starter
Join Date: Mar 2013
Location: 36,000'
Posts: 176
Likes: 0
Received 0 Likes
on
0 Posts
Thank You Capt, makes it very clear. The RWY FMA is under DSC-22_30-80-20 (Engagement Conditions).The aircraft heading is within 20 ° of the ILS related course. Can't seem to make any sense of it.
Only half a speed-brake
MCDU data lock comes at 700 ft, a slightly different thing.
B737NG_Pilot You seem to have taken a very fine comb to extract information from the FCOM, sir. It's admirable, godspeed.
Welcome to the hive.
Originally Posted by FCOM DSC-22_30-80-30-10 Land Mode
LAND mode automatically engages when the LOC and G/S modes are engaged, and the aircraft is below 400 ft RA. The FMA displays “LAND”, indicating that LOC and G/S are locked. No action on the FCU will disengage LAND mode. FLARE and ROLL OUT modes will successively engage.
LAND mode disengages:
‐ Upon engagement of the go-around mode
‐ If the flight crew presses the APPR pb, when the aircraft has been on ground for at least 10 s with the autopilot disconnected
‐ When both AP/FDs are disengaged.
Note: When LAND is not displayed on the FMA, at/or slightly below 400 ft, the landing capability degrades to CAT 1 and the triple click is generated. No autoland is authorized with CAT 1 displayed on the FMA.
LAND mode disengages:
‐ Upon engagement of the go-around mode
‐ If the flight crew presses the APPR pb, when the aircraft has been on ground for at least 10 s with the autopilot disconnected
‐ When both AP/FDs are disengaged.
Note: When LAND is not displayed on the FMA, at/or slightly below 400 ft, the landing capability degrades to CAT 1 and the triple click is generated. No autoland is authorized with CAT 1 displayed on the FMA.
Originally Posted by FCOM PRO-NOR-SRP-01-70 Data Lock
When the aircraft reaches 700 ft RA with APPR mode (LOC and G/S) armed or engaged, the ILS FREQ and course are frozen in the receiver.
This function (ILS tune inhibit) is available, when at least one AP/FD is engaged. Any attempt to change the ILS frequency or CRS, via the MCDU or RMP, does not affect the receiver.
If the speed is managed, the system does not accept any modifications the pilot may enter on the PERF APPR page (surface wind, selected landing configuration, or VAPP) for speed guidance purposes below this altitude.
When the aircraft reaches 400 ft RA, LAND mode engages. The flight crew can only disengage this mode by engaging the GO AROUND mode.
This function (ILS tune inhibit) is available, when at least one AP/FD is engaged. Any attempt to change the ILS frequency or CRS, via the MCDU or RMP, does not affect the receiver.
If the speed is managed, the system does not accept any modifications the pilot may enter on the PERF APPR page (surface wind, selected landing configuration, or VAPP) for speed guidance purposes below this altitude.
When the aircraft reaches 400 ft RA, LAND mode engages. The flight crew can only disengage this mode by engaging the GO AROUND mode.
Welcome to the hive.
Last edited by FlightDetent; 3rd May 2021 at 10:33.
Only half a speed-brake
B737NG_Pilot
The RWY lateral mode provides the YAW BAR on PFD. A director-type indication to help track the localizer signal during take-off roll if necessary. For instance, when visual reference is compromised momentarily.
It first appears after TLs are set for take-off, assuming necessary conditions are met. If you were engaging FLEX whilst more than 20° offset, the HAL just thinks perhaps it's not a centre-line roll you are trying to perform and won't show the yaw-bar (RWY FMA). Can't blame him.
The RWY lateral mode provides the YAW BAR on PFD. A director-type indication to help track the localizer signal during take-off roll if necessary. For instance, when visual reference is compromised momentarily.
It first appears after TLs are set for take-off, assuming necessary conditions are met. If you were engaging FLEX whilst more than 20° offset, the HAL just thinks perhaps it's not a centre-line roll you are trying to perform and won't show the yaw-bar (RWY FMA). Can't blame him.
Join Date: Oct 2015
Location: 43N
Posts: 264
Likes: 0
Received 0 Likes
on
0 Posts
B737NG_Pilot
HAL is something old geezers refer to.
From director Stanley Kubrick and author Arthur C. Clarke’s 2001: A Space Odyssey.
HAL was an all knowing computer, just like the computers on fifi which are all knowing, most of the time!
HAL is something old geezers refer to.
From director Stanley Kubrick and author Arthur C. Clarke’s 2001: A Space Odyssey.HAL was an all knowing computer, just like the computers on fifi which are all knowing, most of the time!
