Temperature - Ch 7

Question 1

SAT

Answer 1

Static Air Temp

Question 2

TAT

Answer 2

Total Air Temperature

Question 3

OAT

Answer 3

Outside Air Temperature

Question 4

RAT

Answer 4

Ram Air Temperature

Question 5

COAT

Answer 5

Corrected Outside Air Temperature

Question 6

IOAT

Answer 6

Indicated Outside Air Temperature

Question 7

Thermal Expansion

Answer 7

Bi-Metallic Strip - Invar and Brass
Very Basic
Amplifies and directional

Question 8

Remote Indication

Answer 8

Electrical Resistance

Wheatstone bridge resistance system - engine core

Question 9

Thermo-couple Probes

Answer 9

Hot end measurement

Exhaust gas temperature - small voltage generated when temp increases (doesn’t need input power)

Question 10

Radiation

Answer 10

Pyrometry = Glow

Higher temp = higher frequency of EM radiation

Question 11

TAT Probe

Answer 11

Total Air Temperature Probe

Nickel plated beryllium copper - good at dissipating heat

Sensor: Platinum wire resistance sensor which shows a linear resistance to temp change, rapid response and high rate of conductivity

Question 12

RAM Rise =

Answer 12

(TAS/100) squared

Question 13

Static Air Temp =

Answer 13

TAT - Measured Ram RIse (Kr)

Question 14

Errors

Answer 14

Icing
Radiated Heat
Friction Heating

Question 15

Aspirated Probe

Answer 15

Draws air through probe at slow speed using engine bleed air
Induced flow gives us more reliable sensing capability (jet Pump)
Creates flow px difference