Question

Determine the ISA standard atmospheric temperature below, and using the actual reported temperature, indicate the ISA deviation. When entering the ISA deviation, include a ''for deviations ABOVE ISA and for deviations below ISA. Include a +/- and number only, do not enter a degree symbol or other label. For example, if the calculated ISA temperature is 10°C, but the reported temperature is 15°C, the ISA Deviation would be 5° above ISA, or +5°C. Pressure Altitude Reported Temperature, ISA Temperature ISA Deviation 12,000 -3°C 4,500 20°C 24,000 -45°C QUESTION 34 With the METAR below, calculate a pressure altitude and density altitude for Aspen (KASE). The Aspen elevation is 7,820. (Use the mathematical calculation methods discussed in the learning modules and provide an answer to the nearest whole foot.) KASE 051753Z 0500SKT 10SM FEW100 23/M04 A3033 RMK AO2 SLP152 T02301040 Pressure Altitude: Density Altitude: QUESTION 35 With the METAR below, calculate a pressure altitude and density altitude for Durango (KDRO). The Durango elevation is 6,685. (Use the mathematical calculation methods discussed in the learning modules and provide an answer to the nearest whole foot.) KDRO 051753Z AUTO VRBO6KT 10SM CLR 28/25 A2980 RMK AO2 SLP100 T02800250 Pressure Altitude: Density Altitude:

can you please answer all three. thanks

Answer 1

33.

Standard temperature is 15 C at sea level. It decreases 2⁰C per 1,000 ft above sea level, At 1,000', ISA temperature = +15 -2 = + 13

so

at 12,000'  pressure height, ISA temperature = +15 -2*12 = - 9

at 4,500' pressure height, ISA temperature = +15 -2 *4.5= + 6

at 24,000' pressure height, ISA temperature = +15 -2*24= - 33

Pressure altitude	Reported Temperature	ISA Temperature	ISA Deviation
12000	-3	-9	+6
4500	20	+6	+14
24000	-45	-33	-12

34.

Altimeter reading = 30.33''

Standard reading is 29.92'' at sea level.

so (29.92-30.33)*1000= -410'

So Pressure altitude 7,820-410 = 7,410'

Density altitude = pressure altitude + 120*(Ooutside air temperature - ISA temperature)

Density altitude= 7,410 + 120*( 23 - ( 15 - 2*7.82 ) ) = 10,246.8'

35.

Altimeter reading = 29.80''

Standard reading is 29.92'' at sea level.

so (29.92-29.80)*1000= 120'

So Pressure altitude 6,685 + 120 = 6,805'

Density altitude = pressure altitude + 120*(Ooutside air temperature - ISA temperature)

Density altitude= 6,805 + 120 ( 28 - ( 15 - 2*6.685 ) ) = 9,969.4'