Greg1 Posted September 8, 2015 Report Posted September 8, 2015 I have a 1994 M20J MSE. The POH shows Vfe as 112 with flaps fully extended. I was wondering what the limit speed is for takeoff flaps of 15 degrees. The POH doesn't seem to offer any guidance on that subject. Quote
mike_elliott Posted September 8, 2015 Report Posted September 8, 2015 Because it is not specified to be any higher in the POH for 15 deg., I personally would limit any flaps to the top of the white arc. While it makes sense that it could be higher for the takeoff position, we have no authority to allow it to be without risk of potentially cracking the sub spar. Quote
PeytonM Posted September 8, 2015 Report Posted September 8, 2015 I have an 89J. I don't have the POH in front if me, so I'm referencing an M20J Information Manual, dated August 1989. (I believe the charts are the same, but I'll have to confirm tomorrow.) In Section V Performance. "Airspeed Calibration-Primary Static System-Flaps/Gear Down," it shows speed for safely lowering flaps 33 at 115 KIAS and 132 KIAS for flaps 15. Comments? Quote
Greg1 Posted September 11, 2015 Author Report Posted September 11, 2015 Thanks for the great replies. Interestingly, my POH on the same page referred to by PeytonM only shows the "speed for safely lowering flaps to 33" as 112 KIAS. So, lacking any guidance to the contrary, I have to agree with Mike that the only alternative is to honor the 112 KIAS limit for both takeoff and landing flaps. 1 Quote
kortopates Posted September 11, 2015 Report Posted September 11, 2015 The newer J's that have the higher flap speed for 15 degrees also have a detent in the flap switch - similar to Cessna. In other words you just move the switch to flaps 15 and the flap go down to there and stop without you needing to do anything. All the other models require you to put the switch back to neutral to stop them - thus very easy to overshoot 15 if busy in flight. Sent from my iPhone using Tapatalk Quote
Greg1 Posted September 11, 2015 Author Report Posted September 11, 2015 My 1994 M20J basically has a three position flap switch. Up, 15 degrees, and 33 degrees. Therefore, no problem with overshooting the desired flap setting. Yet no mention in the POH of a different limit speed for 15 degrees vs 33 degrees. Quote
kortopates Posted September 11, 2015 Report Posted September 11, 2015 It should be there. Make sure you have the proper rev level to your POH for your serial # from the factory web page. Also check the TCDS flap extension speed for your serial number - it should show the faster Flap 15 speed for your serial number. First thing I always do with transition training clients is check for the proper rev level and find out of date POH's frequently. Sent from my iPhone using Tapatalk Quote
Marauder Posted September 12, 2015 Report Posted September 12, 2015 The newer J's that have the higher flap speed for 15 degrees also have a detent in the flap switch - similar to Cessna. In other words you just move the switch to flaps 15 and the flap go down to there and stop without you needing to do anything. All the other models require you to put the switch back to neutral to stop them - thus very easy to overshoot 15 if busy in flight. Sent from my iPhone using Tapatalk Same for the 1975 F model. I have a detent for 15° and 33°. Sent from my iPad using Tapatalk Quote
kortopates Posted September 12, 2015 Report Posted September 12, 2015 Same for the 1975 F model. I have a detent for 15° and 33°. Sent from my iPad using Tapatalk LOL's Quote
jetdriven Posted September 12, 2015 Report Posted September 12, 2015 (edited) My 1994 M20J basically has a three position flap switch. Up, 15 degrees, and 33 degrees. Therefore, no problem with overshooting the desired flap setting. Yet no mention in the POH of a different limit speed for 15 degrees vs 33 degrees. can you send a picture of this flap switch? Sounds like a good retrofit. Edited September 12, 2015 by jetdriven Quote
carusoam Posted September 12, 2015 Report Posted September 12, 2015 (edited) Byron, do you have those photos of my O's instrument panel handy? The three position flap switch is probably the same as the Js built in the mid 90s. The 'knob' is sort of flap shaped similar to my old 65C's aluminum flap pseudo-switch. The complete system would be good. Would also include a few micro-switches for flap position recognition. The switches are mounted under the cabin near the flaps. Does anyone have a picture of the ASI handy? At the top end of the arc is it stepped thinner than the rest of the arc? some plane I flew in differentiated the flap settings and appropriate speeds with a step in the white arc... i am sure the details are documented clearly in modern POHs. really old memory... Best regards, -a- Edited September 12, 2015 by carusoam Quote
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