SAMRA

Question 1

How does drizzle form?

Answer 1

With the condensation in stratus clouds

Question 2

Which lifting process is involved in the formation of TCU in the centre of a low-pressure system?

Answer 2

In the centre of a low-pressure system, several airflows arrive from high-pressure areas and converge.

Question 3

Over mountain ranges, where wind shear and CAT are the most intense?

Answer 3

Above and to the lee of mountain ranges

Question 4

Weather at a frontal system is determined by?

Answer 4

Speed of the cold air mass

Stability and moisture of warm air mass

Question 5

What is the effect of wind on PNR (Point of No Return) and CP (Critical Point)?

Answer 5

Either tail- or headwind, it will shorten the distance to the PNR.

Tailwind : CP closer to departure
Headwind : CP closer to arrival

Question 6

What is the accuracy of GPS position?

Answer 6

6m horizontal
8m vertical
95% of the time

Question 7

At which speed does aerodynamic heating eliminates the risk of ice formation?

Answer 7

Above 500 kts

Question 8

When will TS-associated icing will be the most serious?

Answer 8

During the beginning of the mature stage of the TS

Question 9

Definitions of bursts?

Answer 9

• Macroburst : diameter > 2 NM, winds for 5 to 20 minutes. Can cause tornadoes.
• Microburst : diameter < 2 NM, wind for 5 minutes or less
• Wet : when precipitation reaches the ground
• Dry : when precipitation doesn’t reach the ground. The descending air column contains virga, increasing the burst strength.

Question 10

What does SFC WND SPD mean in an AIRMET?

Answer 10

Surface winds will blow at 30 kts or more

Question 11

What are the 3 types of fixed RNAV routes?

Answer 11

• Q : High Level RNAV route, controlled
• T : Low Level RNAV route, controlled
• L : Low Level RNAV route, uncontrolled

Question 12

On which technology(ies) is ADS-B based?

Answer 12

On aircraft avionics, satellites and/or ground infrastructure, to relay a range of aircraft parameters to the ATC.

Question 13

What can cause attenuation on a Wx radar?

Answer 13

The accumulation of ice on the radome

Question 14

What are the 3 levels of rain on a Wx radar screen?

Answer 14

• Level 1 : light rain
• Level 2 : medium rain
• Level 3 : heavy rain

Question 15

Time to station formula? (VOR)

Answer 15

Time in min = Time in sec / diff. radials

Question 16

On a 250hPa chart, how do you recognize sufficient horizontal shear for CAT?

Answer 16

30kts isotachs are closer than 90NM from each other (generally on the low-pressure side of the jet stream)

Question 17

What is the expected accuracy to be expected for RNAV?

Answer 17

95%

Question 18

How does steam fog form?

Answer 18

Cold air moving over warm water

Question 19

In HF frequency, what is the difference between single-side band (SSB) and dual-side band (DSB) ?

Answer 19

SSB signal is stronger and covers greater distances than DSB

Question 20

When can an ELT 406 be tested?

Answer 20

At the time indicated by manufacturer’s instructions

Question 21

What accuracy should unpublished VOR radials meet?

Answer 21

None, unpublished radials are not required to meet a particular standard of accuracy

Question 22

If turbulence is to be met near a sloping tropopause, where will the turbulences be most pronounced?

Answer 22

On the temperature-change zone, in the stratospheric side of the sloping tropopause

Question 23

What is the formula to calculate the critical point?

Answer 23

Total trip distance x GS to go back
/
GS to go back + GS to go to destination

Question 24

The vertical distance between any two specific pressure levels is…

Answer 24

Less in cold air than in warm air

Question 25

What instrument can be used to measure humidity in the air?

Answer 25

Psychrometer

It consists of a wet-bulb T°-meter and a dry-bulb T°-meter. Also called hygrometer.

Question 26

What is implied by the presence of snow grains precipitations on the ground?

Answer 26

Snow grains imply that FZDZ is present aloft.

Question 27

Air masses over Great Lakes and their consequences…

Answer 27

cA moving southbound during winter : snow showers immediately to the south of southern shorelines

cA moving southbound during early autumn : steam fog over northern portions of the GL

mT moving northbound during spring and early summer : low stratus clouds, drizzle and fog over north shores.

Question 28

Which meteorological process reduces the relative humidity and causes water to evaporate?

Answer 28

Subsidence

Question 29

What causes ADF night effect?

Answer 29

Sky waves directed to the earth interfere with ground waves.

Question 30

On which range of frequencies ACARS and SELCAL work?

Answer 30

HF and VHF.

ACARS is supported by SATCOM over oceanic areas.
SELCAL works mostly on HF.

Question 31

What is mainly determining the intensity of radar echo on an airborne Wx radar?

Answer 31

Size of the drops (at a greater extent than number of them)

Question 32

Minimum speed for a wind to qualify as a jet stream?

Answer 32

60 kts

Question 33

On a Wx radar image, what a hook shape and a finger shape indicate?

Answer 33

Hook = severe turbulence or tornado activity

Finger = hail

Question 34

Where is MLAT (Multilateration) used?

Answer 34

On the ground, to provide full surveillance coverage of RWYs, TWYs and aprons areas.

Question 35

What is the typical area covered along a planned flight path for visual research in SAR?

Answer 35

15 NM.

Question 36

What are the codes to put in Item 10 of flight plan to indicate that RVSM or MNPS is approved?

Answer 36

RVSM = W

MNPS = X