Examples of Messages (MCDU & EIS)
Figure 010
(2) Minimization of message display during takeoff, go around and approach below 800 ft.AGL (AGL : Above Ground Level)
Considering COND A = | A/C in Takeoff, Go Around or Approach | and | A/C height below 800 ft.
The general idea is that, so as to minimize message display on the
MCDU when COND A is true, only two kinds of messages may be
displayed.
These are:
-important messages (mainly concerning navigation) which may appear "by themselves" (group I).
-message which are only displayed as an immediate result of a pilot
action on the MCDU (group II). Banned messages will be displayed - if still applicable - when COND A becomes false. The following table specifies which category each message belongs to.
-N : means banned
-/ : means not applicable by definition (the normal conditions of display of the message being not compatible with COND A)
-Y : means allowed.
(3) Message display rules There are various messages displayed on the MCDU for pilot information. All messages are displayed in the scratchpad line of the MCDU. There are two types of messages.
(a)
Type I messages Type I messages are those displayed as the direct result of pilot action. There is no message queue for Type I messages. Consequently, a Type I message exists only if it is presently displayed in the scratchpad.
(b)
Type II messages Type II messages are those that are displayed automatically to inform the pilot of a given situation or to request a pilot action. Type II messages are stored in a last-in/first-out message queue. A maximum of five messages may be stored, and if a sixth message is received, the one at the bottom of the queue is lost. (Ref. Fig. 011) Only one occurence of a given message can exist in the queue. Therefore, when a message is generated, it is placed on the top of the queue and any previous occurrence is deleted. (Ref. Fig. 011)
Message Queue Operation
Figure 011
The message at the top of the queue is displayed in the scratchpad only if there are no Type I messages or data to be displayed. This results in the following operation:
-
A Type II message displayed in the scratchpad is deleted if data is entered. The message is displayed again when the scratchpad becomes empty.
-
A Type II message generated while data or a Type I message is occupying the scratchpad is displayed only when the scratchpad becomes empty.
If a Type II message is cleared while it is in the scratchpad, then the next one in the queue is displayed.
(4)
Clearing messages
-Any message that is displayed can be cleared by pushing the CLR function key.
-Type I messages are automatically cleared under the following conditions: when data is entered into the scratchpad, or when line select or mode key is pushed.
-Certain Type II messages are automatically cleared from the queue when they no longer apply.
(5)
Table of message list
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| TEXT | COLOR | TO-GA | TYPE | DISPLAY CONDITION | | | | APPR | | | |------------------------|-------|-------|------|-----------------------------| | A/C POSITION INVALID | A | Y | II | A/C position invalid or | | | | | | becoming invalid on HOLD or | | | | | | DIR TO page | |------------------------|-------|-------|------|-----------------------------| | ALIGN IRS | A | / | II | On INIT A page after display| | | | | | of origin airport reference | |------------------------|-------|-------|------|-----------------------------| | ALTN F-PLN DELETED | W | N | II | F-PLN storage overflow | |------------------------|-------|-------|------|-----------------------------| | AWY/WPT MISMATCH | W | N | I | Appears with VIA/GO TO on | | | | | | LAT REV page. The revised | | | | | | - or GO TO - point is not on| | | | | | the entered airway | |------------------------|-------|-------|------|-----------------------------| | CABIN RATE EXCEEDED | W | / | II | Computed descent cabin rate | | | | | | greater than 300 ft/mn | |------------------------|-------|-------|------|-----------------------------| | CHECK A/C POSITION | A | Y | II | |Radio Pos-Inertial Pos| | | | | | | greater than 12 NM while | | | | | | DME/DME/Inertial or VOR/DME/| | | | | | Inertial position remains | | | | | | valid | |------------------------|-------|-------|------|-----------------------------| | CHECK APPR GUIDANCE | | | | At 100 NM from T/D or from | | (EIS PFD) | A | N | II | DES phase active, and when | | | | | | APPR phase is active | |------------------------|-------|-------|------|-----------------------------| | CHECK DATA BASE CYCLE | W | N | II | After a CO RTE entry on | | | | | | INIT A page, clock date and | | | | | | data base effectivity do not| | | | | | match | |------------------------|-------|-------|------|-----------------------------| | CHECK GW | A | N | II | FM and FAC computed gross | | | | | | weight disagree by more than| | | | | | 5 tons | |------------------------|-------|-------|------|-----------------------------| | CHECK QFE | A | Y | II | At transition from QNH to | | | | | | QFE or QFE to QNH, if | | | | | | |ADC baro alt - ADC Std alt|| | | | | | > or equal 100 ft. | |------------------------|-------|-------|------|-----------------------------| | CLK IS TAKEOFF TIME | W | / | II | During preflight if a time | | | | | | constraint has been entered |
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