A320 LAND & RWY FMA's

[B737NG_Pilot]

FINAL FMA


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?

RWY FMA
One of the engagement conditions state:

The aircraft heading is within 20 ° of the ILS related course. When will this condition be applicable ?

[CaptainMongo]

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)

https://cimg2.ibsrv.net/gimg/pprune.org-vbulletin/989x829/92046963_0622_4180_a913_69798f77bcd7_62bfe714c11e8635566b28f 462e48452635d8d04.jpeg

https://cimg4.ibsrv.net/gimg/pprune.org-vbulletin/1245x630/838465ac_826b_4223_842e_12dba8172476_4f40d58b541828a8728a9bc 2bc1b246063a1da7f.jpeg

[B737NG_Pilot]

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.

[B737NG_Pilot]

Torque.... My mistake... :ugh:

Thanks a lot for making it clear.

[FlightDetent]

MCDU data lock comes at 700 ft, a slightly different thing.

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.

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.

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.

[FlightDetent]

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.

[B737NG_Pilot]

Thank You Flight Detent...... May be on an engine run up? Have been trying to work out scenarios where this would be applicable. What's HAL?

[B737NG_Pilot]

Thanks Flight Detent... was able to relate to similar FMA's on the B737. The 737 had LAND 3 / LAND 2 depending on approach capability for an AUTOLAND.

[CaptainMongo]

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!

[B737NG_Pilot]

Thought So.,,,,, but didn't wanna miss out knowing any new Airbus Terminology.