Ch 5 - Airplane Performance & Weight & Balance - Questions 519 - 569 Flashcards
What are the standard temperatures and pressure values for seal level?
15 degrees celcius and 29.92 Hg.
What effect, if any, does high humidity have on aircraft performance?
It decreases performance
Which factor would tend to increase the density altitude at a given airport?
An increase in ambient temperature
What effect does high density altitude, as compared to low density altitude, have on propeller efficiency and why?
Efficiency is reduce because the propeller exerts less force at high density altitudes than at low density altitudes
What effect does high density altitude have on aircraft performance?
It reduces climb performance
Which combination of atmospheric conditions will reduce aircraft takeoff and climb performance?
High temperature, low relative humidity, and low density altitude
As air temperature increases, density altitude will
Increase
You have planned a cross-country flight on a warm spring morning. Your includes a mountain pass which is at 11,500 feet MSL. The service ceiling of your airplane is 14,000 feet MSL. After checking the local weather report, you re able to calcite the density altitude of the mountain pass as 14,800 feet MSL. Which of the following is the correct action to take?
Replan your journey to avoid the mountain pass
A pilot and two passengers landed on a 2,100 foot east-west gravel strip with an elevation of 1,800 feet. The temperature is warmer than expected and after computing the density altitude it is determined the takeoff distance over a 50 foot obstacle is 1,980 feet. The airplane is 75 pounds under gross weight. What would be the best choice?
Wait until the temperature decreases, and recalculate that takeoff performance
If the outside air temperate (OAT) at a given altitude is warmer than standard, the density altitude is
High than pressure altitude
(Refer to Fg 8 on Pg 217) Determined the density altitude for these conditions:
Altimeter setting = 30.35
Runway temperature = +25 degrees F
Airport elevation = 3,894 ft. MSL
2,000 feet MSL
(Refer to Fg 8 on Pg 217) What is the effect of a temperature increase from 35 to 50 degrees F on the density altitude if the pressure altitude remains at 3,000 feet MSL?
1,000 fat increase
(Refer to Fg 8 on Pg 217) What is the effect of a temperature decrease and a pressure altitude increase on the density altitude from 90 degrees F and 1,250 feet pressure altitude to 55 degrees F and 1,750 feet pressure altitude?
1,700-foot decrease
(Refer to Fg 8 on Pg 219) Determine the pressure altitude at an airport that is 3,563 feet MSL with an altimeter setting of 29.96.
3,527 feet MSL
(Refer to Fg 8 on Pg 219) Determine the pressure altitude at an airport that is 1,386 feet MSL with an altimeter setting of 29.97.
1,341 feet MSL
(Refer to Fg 8 on Pg 219) What is the effect of a temperature increase from 25-50 degrees F on the deny altitude of the pressure altitude remains at 5,000 feet?
1,650-foot increase
(Refer to Fg 8 on Pg 219) Determine the density altitude for these conditions:
Altimeter Setting = 29.25
Runway Temperature = +81 degrees F
Airport Elevation = 5,250 Ft. MSL
8,500 feet MSL
(Refer to Fg 40 on Pg 220) Determine the approximate ground roll distance required for takeoff.
OAT = 38 degrees C
Pressure Altitude = 2,000 ft
Takeoff Weight - 2,750 lb
Headwind Component = Calm
1,150 feet
(Refer to Fg 40 on Pg 220) Determine the Toal distance required for takeoff to clear a 50-foot obstacle
OAT = Std
Pressure altitude = Sea Level
Takeoff weight = 2,700 lb.
Headwind Component = Calm
1,000 feet