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Green band on ASI
This may seem a little academic, but definition of the lower limit of the
green band on ASIs is inconsistent in places. EASA Certification Specifications for Sailplanes and Powered Sailplanes, CS 22.1545 (Air-speed indicator): "Each air-speed indicator must show the following markings: ... (c) for the normal operating range, a green arc with the lower limit at 1.1 VS1 with maximum weight and for wing-flaps neutral (see AMC 22.335) and landing gear retracted and the upper limit at the rough-air speed VRA." So far so good. Many people fly aircraft certified to CS22, or its predecessor JAR22. The latter dating back to at least 1981. Even before that, the lower limit of the green band should have set according to the flight manual. However, the FAA Glider Flying Handbook seems to be at variance. It says (p4-5): * The lower limit of the green arc — stalling speed with the wing flaps and landing gear retracted. Since there is little reason to fly at less than min sink, flying at stall speed doesn't seem like the normal operating range. |
#2
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Green band on ASI
On Fri, 21 Feb 2020 10:38:33 +0000, John McCullagh wrote:
This may seem a little academic, but definition of the lower limit of the green band on ASIs is inconsistent in places. EASA Certification Specifications for Sailplanes and Powered Sailplanes, CS 22.1545 (Air-speed indicator): "Each air-speed indicator must show the following markings: ... (c) for the normal operating range, a green arc with the lower limit at 1.1 VS1 with maximum weight and for wing-flaps neutral (see AMC 22.335) and landing gear retracted and the upper limit at the rough-air speed VRA." So far so good. Many people fly aircraft certified to CS22, or its predecessor JAR22. The latter dating back to at least 1981. Even before that, the lower limit of the green band should have set according to the flight manual. However, the FAA Glider Flying Handbook seems to be at variance. It says (p4-5): * The lower limit of the green arc — stalling speed with the wing flaps and landing gear retracted. Since there is little reason to fly at less than min sink, flying at stall speed doesn't seem like the normal operating range. Curiosity: why is this a problem unless you're shipping a glider from USA to Europe or vice versa? After all, FAA != EASA -- Martin | martin at Gregorie | gregorie dot org |
#3
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Green band on ASI
The FAA Glider Flying Handbook is not a basis for aircraft certification. It is simply wrong here.
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#4
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Green band on ASI
I sometimes fly at less than minimum sink speed, e.g., when flying in a
narrow area of weak wave.* Whereas the lower speed increases the sink rate, the longer time in the lift plus the smaller turn radius, I believe, improves my overall climb.* I could be wrong, of course. On 2/21/2020 3:38 AM, John McCullagh wrote: This may seem a little academic, but definition of the lower limit of the green band on ASIs is inconsistent in places. EASA Certification Specifications for Sailplanes and Powered Sailplanes, CS 22.1545 (Air-speed indicator): "Each air-speed indicator must show the following markings: ... (c) for the normal operating range, a green arc with the lower limit at 1.1 VS1 with maximum weight and for wing-flaps neutral (see AMC 22.335) and landing gear retracted and the upper limit at the rough-air speed VRA." So far so good. Many people fly aircraft certified to CS22, or its predecessor JAR22. The latter dating back to at least 1981. Even before that, the lower limit of the green band should have set according to the flight manual. However, the FAA Glider Flying Handbook seems to be at variance. It says (p4-5): * The lower limit of the green arc — stalling speed with the wing flaps and landing gear retracted. Since there is little reason to fly at less than min sink, flying at stall speed doesn't seem like the normal operating range. -- Dan, 5J |
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