Some Rules Of Thumb
(A collection of 727 & other flying hints)
Revised 25-Mar-2001

 LANDING , 727 To Find Flaps 30 V Ref for Weight 1.      Take the weight in thousands over a 100,000lbs 2.      Divide by 2 3.      Add 107 Example Let's say our weight is 140,000lb's, find the flap 30 V Ref Weight over 100,000lbs is 40 Divide 40 by 2 to get 20 Add 107 to get V Ref Flap 30 So That's 20+107 That equals 127 Kts IAS ( It's Pretty Close, Eh!)
 Other Speeds, 727 To Find Flaps 15 V Ref use the above procedure and add 122 at item 3 instead of 107 (increase of 15) So Flap 15 V Ref is 20+122 = 142 Kts To Find Flaps 5 V Ref Use the above procedure but add 137 at item 3 instead of 107 (increase of 30) So Flap 5 V Ref is 20+137 = 157 Kts To Find Flaps 0 V Ref Use the above procedure but add 167 at item 3 instead of 107 (increase of 60) So Flap 5 V Ref is 20+167 = 187 Kts
 TAKEOFF, 727 Estimation of Take Off V Speeds Flap 15 V2 Speed will be 12 Kts more than V1/VR speed Flap 5 speeds should be about 8 kts more than flaps 15 V1/VR speed Flap 25 speeds will be about 8 kts less than flaps 15 V1/VR speed Again you use the above procedure but add 104 at item 3 Using the same 140,000lb's example Weight over 100,000lbs is 40 Divide 40 by 2 to get 20 Add 104 to get V Ref Flap 15 So That's 20+104 That equals 124 Kts This is an approximation of V Ref flaps 40 and V1/VR for flaps 15. So finishing the example using the above criteria Flap 15                                  Flap 5                                     Flap 25 V1/VR 124                             V1/VR+8=132                       V1/VR-8=116 V2 124+12=136                    V2 132+12=144                    V2 116+12=128
 Climb Speeds, 727 727-200 Best Climb Speed: 1/2 Gross Weight Over 100,000 + 270 = Climb Speed Again the using that 140,000 lb example. 20+ 270=290 Kts 727-100 Best Climb Speed: 1/2 Gross Weight Over 100,000 + 280 = Climb Speed Again the using that 140,000 lb example. 20+ 270=300 Kts
 DECENT, All 727 Best Decent Rate 3* the altitude to loose distance to start down (approx 280 kts-2500fpm) Example FL 350 3*35=105 NM TOD ( Don't forget you may need to slow down) Best Decent Gradient Altitude (FL) = Descent angle then multiply by miles per min = decent fpm in (100') Distance (NM) Example FL200 Dist 50 NM 200     =Decent angle 4 then * mile per min say (6) = 24 =PO(2,400 fpm)
 CRUISE, 727 Initial Cruise EPR: To determine the initial cruise EPR you can use the following formula to be approximate Twice the altitude (FL) +1/2 the Gross Weight over 100,000= Last two digits of cruise EPR. Example 140,000lb's at FL33 - So 2* 33=66+ (40/2=20)=1.86
 LANDING , 727 To Find VDP If the VDP is not published, take the altitude to descend from the MDA to TDZE (number in parentheses next to MDA) and move the decimal point one place to the left. This gives you your time in sec's to subtract from time to MDA to get time to VDP. Don't miss the runway its career limiting
 Temperature All & 727 To Find ISA & TAT To Obtain ISA Temp Double the altitude and subtract 15 To Obtain TAT From ISA @ .80M add 30
 Meters Per second to Knots, All Don't get clever just double it to get knots. So if some "metric" twat gives you a "clear to land wind is 230 at 12 meters sec" it's 24 knots give or take a tad. 3 meters a second is 6 knots, get the idea.
 Time / Distance, 727 The first 100 NM will take approx 17 min's time you clean up and get going, (+/- 2 min, which is what you can cock it up by anyway)
 DME ARC LEAD (Turn Lead Point) ALL For DME Arcs lead the arc by one percent of your ground speed. For example if you ground speed is 220 Kts lead the arc (turn on) by 2.2 NM. Make sure you get a rate one turn on, Don't mess about at 10 deg bank).
 Approach Speed Power Setting (30 Flap), 727 As a general guide set the Fuel Flow around 3500 lbs, (give or take a bit depending on your weight). This should be close to nail the required bug speed on approach. (Ballpark Figure). A heavy 200 will need a little more.