There are a minimum number of hours specified by Federal Aviation Regulations (FARs) Part 61. I don't know the average now, but the national average used to be about 20 hours over the minimum. Those students who took less than the national average were those who took 3 to 5 lessons a week (some went 7 days).
A rare but very serious risk associated with blood transfusions is transfusion-related acute lung injury (TRALI). It occurs more often with platelets and plasma than with red cells. TRALI is a poorly understood condition, in which a personâs lungs suddenly become very inflamed within six hours of the transfusion.
Packed red blood cell transfusions are given to increase the oxygen-carrying capacity of the patientâs blood. There may be several reasons why your blood supply is low. You may have a low hemoglobin and hematocrit reading (anemia), loss of blood during surgery or trauma, or bleeding internally in the intestines. The loss of blood may be sudden (acute) or slow (chronic). A packed red blood cell transfusion is almost always necessary for a blood loss of more than 30 percent. Transfusions are indicated when the blood pressure decreases and the heart rate increases during an episode of bleeding. Chronic anemia patients may not need a blood transfusion if they are not showing symptoms of a crisis. Chronic anemia should be treated with methods other than transfusions.