E. Flight le vel
Flight le vel is dis play ed in ALT mode in the bot tom line of the dis play (al ti tu de
= FL x 100 in ft):
Fig. 3-5 Flight le vel in di ca ti on
F. Self tests of the unit (BITs)
The fol lo wing dif fe rent tests are in te gra ted in the trans pon der or can be trig ge red at
the trans pon der:
(1) The IBIT (Ini tia ted Built-in Test) can be ac ti vat ed in any mode (ex clu ding the
con figu ra ti on mode) with the push of (F) and (G) at the same time. The ac ti on
starts with the lea ding edge of the se cond pus hed but ton.
The IBIT works as fol lows in all modes:
The test starts with all avai la ble test rou ti nes inclu ding the trans mit ter test rou-
tine. Du ring the test, “IBIT” is in di ca ted on the dis play.The test takes not lon-
ger than 1 se cond. If the IBIT was suc cess ful, the XPDR swit ches immediately
into the nor mal ope ra ting mode. Du ring the IBIT any ac ti on from ot her switches
is not re cognized.
Negative results of the IBIT are indicated on the display with “FAILURE”. The
transponder may be not switched into ON or ALT mode if any failure was
found.
(2) The CBIT (Continuous Built-in Test) works as follows:
The continuous BIT acts as a kind of watchdog during operation. Negative
results of the CBIT are indicated on the display with “FAILURE”. In this case
the transponder may be not switched into ON or ALT mode (display indication
of operating mode set to SBY) if any failure was found.
(3) The PBIT (Power-on Built-in Test) works as follows:
The XPDR has a power-on BIT after switching on. During the PBIT any actions
from other switches are not accepted.
During the PBIT the XPDR is in the SBY mode but this is not indicated on the
display. The operating mode indication on the display starts immediately after
finalisation of the PBIT.
INSTALLATION AND OPE RA TION BXP6401-X-(XX)
Page 3-4
34-50-08 Sep tem ber 2011
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