Eye Height Reference Device - Boeing 737
Thread Starter
Eye Height Reference Device - Boeing 737
Hello All:
FAR 25.773 (d) mandates installation of a 'fixed marker or other guide' in transport category aircraft to ensure that the pilots adjust their seating position such that they are positioned at the design eye reference point.
Looking at pictures of 737-500 flight compartments, I cannot see any evidence of an 'occluded sphere' type reference device installed on the windshield center post. Did Boeing use a different type of 'fixed marker or other guide' on these early 737s to comply with this FAR, and if so, what methodology did they use? Or, were these aircraft built to a certification basis that preceded publication of FAR 25.773 (d)?
Many thanks in advance for any light that an expert could shed on this question.
(Question was originally posted in the 'Flight Test' forum, but received no response there.)
FAR 25.773 (d) mandates installation of a 'fixed marker or other guide' in transport category aircraft to ensure that the pilots adjust their seating position such that they are positioned at the design eye reference point.
Looking at pictures of 737-500 flight compartments, I cannot see any evidence of an 'occluded sphere' type reference device installed on the windshield center post. Did Boeing use a different type of 'fixed marker or other guide' on these early 737s to comply with this FAR, and if so, what methodology did they use? Or, were these aircraft built to a certification basis that preceded publication of FAR 25.773 (d)?
Many thanks in advance for any light that an expert could shed on this question.
(Question was originally posted in the 'Flight Test' forum, but received no response there.)
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HI,
I believe looking in your aircraft systems manual,in the section #pilot seat adjustment#you may just find the answer.could tell u but too lazy.
OK change of mind...pilots hould sit in order to see the top glareshield and the bottom of the outboard display....then its up to you in flight to readjust this to feel comfy....
Capt STD
I believe looking in your aircraft systems manual,in the section #pilot seat adjustment#you may just find the answer.could tell u but too lazy.
OK change of mind...pilots hould sit in order to see the top glareshield and the bottom of the outboard display....then its up to you in flight to readjust this to feel comfy....
Capt STD
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Originally Posted by V1... Ooops
Looking at pictures of 737-500 flight compartments, I cannot see any evidence of an 'occluded sphere' type reference device installed on the windshield center post. Did Boeing use a different type of 'fixed marker or other guide' on these early 737s to comply with this FAR, and if so, what methodology did they use? Or, were these aircraft built to a certification basis that preceded publication of FAR 25.773 (d)?
Many thanks in advance for any light that an expert could shed on this question.
Many thanks in advance for any light that an expert could shed on this question.
Thread Starter
Originally Posted by Boingboingdriver
...I believe looking in your aircraft systems manual...
Originally Posted by AirRabbit
...If you check the flight crew operating manuals...
So - in light of the fact that I have neither an actual 737-500 or a FCOM for a 737-500 handy - can anyone tell me if there is 'fixed marker or other guide' (the exact wording of the applicable FAR) installed in 737-500s to enable the pilots to ensure that they have positioned themselves at the DERP?
AirRabbit has explained that one can adjust seating appropriately by making three reference checks, and this makes a lot of sense, but does this fulfill the requirement for the 'fixed marker or other guide'?
Many thanks in advance to anyone who can tell me if there is a physical 'fixed marker or other guide' in the 737-500.
Yes it meets the requirement of "other guide". The last B737 that had the ball guide I have flown was a B737QC-200ADV circa 1981, we had some later model B737 200ADV new from the factory and they did not have the balls fitted.
Our B737-300 aircraft were delivered from the last batch of CL B737 (1998/9) Boeing built and none of those had the ball either.
From a trainer point of view, if you position to the exact sighting picture as per the FCTM then you will be set at the same eye height.
Our B737-300 aircraft were delivered from the last batch of CL B737 (1998/9) Boeing built and none of those had the ball either.
From a trainer point of view, if you position to the exact sighting picture as per the FCTM then you will be set at the same eye height.
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Originally Posted by V1… Ooops
AirRabbit has explained that one can adjust seating appropriately by making three reference checks, and this makes a lot of sense, but does this fulfill the requirement for the 'fixed marker or other guide'?
I've tried using the recommended seat positions on several types of Boeing, using exactly the procedures in the manuals and have always ended up in a posture where flying is almost impossible.
I have found that if a) I have a line of sight down the coaming and over the nose, b) the instruments are visible and c) I can get full control movement without hitting myself, then I have a good chance of taking off and landing without too many issues. Observing people I fly with, there is much variation in how they sit, so there's probably quite a large optimum band.
I have found that if a) I have a line of sight down the coaming and over the nose, b) the instruments are visible and c) I can get full control movement without hitting myself, then I have a good chance of taking off and landing without too many issues. Observing people I fly with, there is much variation in how they sit, so there's probably quite a large optimum band.
Thread Starter
Hello AirRabbit:
Thanks very much for the complete and comprehensive answer. I was truly puzzled by the lack of a traditional 'occluded sphere' device, but after having read your response, everything now makes sense.
Thanks very much for the complete and comprehensive answer. I was truly puzzled by the lack of a traditional 'occluded sphere' device, but after having read your response, everything now makes sense.
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How is adjusting your seat in a plane any different to adjusting your seat in a car?
If you're comfy...... you're comfy. Just twiddle the levers until you can see and reach everything.... Hardly a moonshot.
bbbbbbbbzzzzzzzzzzzzbbbbbbbzzzzzzzzzzzzzzzzz
If you're comfy...... you're comfy. Just twiddle the levers until you can see and reach everything.... Hardly a moonshot.
bbbbbbbbzzzzzzzzzzzzbbbbbbbzzzzzzzzzzzzzzzzz
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Originally Posted by V1... Ooops
Hello AirRabbit:
Thanks very much for the complete and comprehensive answer. I was truly puzzled by the lack of a traditional 'occluded sphere' device, but after having read your response, everything now makes sense.
Thanks very much for the complete and comprehensive answer. I was truly puzzled by the lack of a traditional 'occluded sphere' device, but after having read your response, everything now makes sense.
Originally Posted by Mr.Buzzy
How is adjusting your seat in a plane any different to adjusting your seat in a car?
If you're comfy...... you're comfy. Just twiddle the levers until you can see and reach everything.
If you're comfy...... you're comfy. Just twiddle the levers until you can see and reach everything.