GPWS

Question 1

GPWS was created to prevent

Answer 1

CFIT- controlled flight into terrain

Question 2

GWS inputs

Answer 2

ADC(VSI & IAS)
rad alt 
config
IRS- attitude 
ILS - glide slope
FMS - for enhanced GPWS

Question 3

GWS out puts

Answer 3

master indication
amber below glide slope light
red pull up light
audio warning

Question 4

Alert

Answer 4

caution
precedes a waring
crew must modify flight path or config unit alert stops

Question 5

Warning

Answer 5

command that must be followed

done by flying max climb angle until reaching the MSA

Question 6

alerts and warnings: genuine, nuisance, false

Answer 6

genuine- its legit
nuisance - system working correct butactivates in a safe situation
false- system not working correctly

Question 7

GPWS limitation

Answer 7

can only see below and not infront

Question 8

EPGWS

Answer 8

enhanced GPWS
includes forward looking terrain avoidance- terrain avoidance warnings systems (TAWS)
uses 3D terrain database which compares to a/c FMS position and looks ahead to predict threats

Question 9

EPGWS alerts and warnings timings

Answer 9

alerts 40-60s

warnings 20-30s

Question 10

EPGWS requirements

Answer 10

turbine: MTOM>5700kg or >9 Pax seats - TAWS A
piston: MTOM>5700kg or >9 Pax seats - TAWS B

Question 11

TAWS A + B

Answer 11

both:
forward looking terrain avoidance
premature descent alert
voice call out 500ft above terrain

TAWS A also has
terrain display
needs 4-D FMS connection

Question 12

what does an inhibitor switch do?

Answer 12

panel allows you to inhibit parts of the system

Question 13

EPGWS errors

Answer 13

map shift- if a/c calculated position is wrong

Question 14

GPWS is active between

Answer 14

50-2500ft (2450ft sometimes quoted)

based on rad alt

Question 15

GPWS mode 1

Answer 15

excessive descent rate 
rate of descent is too high at low alt 
aural alert - sink rate sink rate 
aural warning - whoop whoop pull up 
visual warning - pull up

Question 16

GPWS mode 2

Answer 16

excessive terrain closure rate 
rapid closure rate between a/c and ground based on rad alt
aural alert - terrain terrain
aural warning- whoop whoop pull up
visual alert & warning - pull up

Question 17

GPWS mode 3

Answer 17

altitude loss after take off or go around
barometric alt lost after take off
aural alert- don’t sink don’t sink
visual warning - pull up

Question 18

GPWS mode 4

Answer 18

unsafe terrain clearance 
too close to ground for a specific phase of flight
mode 4A: with gear retracted
aural alert- too low gear 
visual warning - pull up

mode 4B: gear extended flaps retracted
aural alert- too low flaps
visual warning- pull up

Question 19

GPWS mode 5

Answer 19

glide slope deviation alert - if too far beneath g/s
aural alert - glide slope glide slope
visual warning - below glide slope light

Question 20

GPWS mode 6

Answer 20

altitude and excessive bank angle call outs
rad alt based call outs
minimums call outs
bank angle bank angle call out- excessive bank angles at low alt

Question 21

GPWS mode 7

Answer 21

wind shear alert - activates when a/c is in wind shear 
inputs:
airspeed
ground speed
vertical speed
AOA
wind
aural alert- wind shear wind shear 
perform wind shear go around 
active below 1500ft on rad alt

Question 22

predictive wind shear

Answer 22

uses weather radar to spot wind shear associated with moisture and displays the affected area on the ND
wind shear wind shear - perform standard go around
avoid affected area

Question 23

terrain display

Answer 23

different colours used to show where terrain is relative to a/c

Question 24

terrain clearance floor

Answer 24

eventually get low enough on approach that GPWS would activate
area built around runway in which activation is limited
this will only activate for the runway you choose in the FMS