OPTIMUM FLIFGTLEVEL

OPTIMUM FLIGHT LEVEL vs STAGE LENGTH.

This table give the maximum and optimum cruise flight level for a given gross weight or the maximum and optimum gross weight for a given flight level.

Valid for DC9.

Optimum FL vs Total distance(no wind, STD temp, normal cruise)
TOW (t)	100 NM	120 NM	140 NM	160 NM	180 NM	200 NM	220 NM	240 NM	260 NM	280 NM	300 NM	320 NM	340 NM	Max initial FL
51,7 51 50							270	290	300	310 310	310 310 320	320 320 320	330 330 330	310 320 330
49 48 47	130	170 180	210 210	230 230	250 250 250	260 260 260	280 280 280	290 290 300	300 310 310	310 320 330	320 320 330	330 330 330	340 340 340	340 340 350
46 45 44	140 140 150	180 190 190	220 220 220	240 240 240	260 260 260	270 270 270	280 290 290	300 300 310	310 320 320	320 330 330	330 330 340	330 340 350	340 350 350	350 350 350
43 42 41	150 160 160	190 200 200	230 230 230	250 250 250	270 270 270	280 280 280	290 300 300	310 310 320	320 320 330	330 340 340	340 340 350	350 350 350	350 350 350	350 350 350
40 39 38	170 170 170	210 210 210	240 240 240	260 260 270	280 280 280	290 290 290	300 310 310	320 320 330	330 330 340	350 350 350	350 350 350	350 350 350	350 350 350	350 350 350
37 36 35	180 180 180	220 220 230	250 250 250	270 270 280	290 290 300	300 300 310	310 320 320	330 330 340	340 350 350	350 350 350	350 350 350	350 350 350	350 350 350	350 350 350
Corrections: HEADWIND: Increase total distance by 5% per 20kt. TAILWIND: Reduce total distance by 3% per 20kt.

Valid for MD80/90.

Optimum FL vs Total distance(no wind, STD temp, normal cruise)
TOW (t)	100 NM	120 NM	140 NM	160 NM	180 NM	200 NM	220 NM	240 NM	260 NM	280 NM	300 NM	Max initial FL
72 70												290 310
68 66 64 62 60	130 130 130	160 160 170	190 190 200	210 210 220	240 240 250	260 260 270	280 280 290	290 300 310	320 320 320	330 330 330	330 330 330	310 310 330 330 330
58 56 54 52 50	130 140 140 150 150	170 180 180 190 190	200 210 210 220 220	220 230 240 250 250	250 260 260 270 280	270 280 290 290 300	300 310 310 320 320	310 320 320 330 330	330 330 340 340 350	330 350 350 350 350	350 350 350 350 370	350 350 350 370 370
48 46	160 160	200 200	230 230	260 270	290 290	310 310	320 330	340 340	350 360	360 360	370 370	370 370
Corrections: HEADWIND: Increase total distance by 5% per 20kt. TAILWIND: Reduce total distance by 3% per 20kt.

Valid for B767.

SHORT DISTANCE FLIGHT LEVEL.
Flight level selection for short range operation may be limited by the distance required to perform the climb and descent. The table below shows the maximum flight level at which it is possible to cruise foe at least one minute in level flight.

Flight level vs trip distance SAT = STD
TOW(t)	150 NM	200 NM	250 NM	300 NM
150 140 130 120 110 100	210 220 230 250 260 280	260 270 290 310 330 350	300 320 340 350 380 400	330 340 360 380 400 430
Correction: For SAT=STD+20, reduce by 3000 ft

LONG DISTANCE FLIGHT LEVEL
For long flights, use these tables to find the MAX INITIAL FL and the weight at which you will be able to climb further (STEP CLIMB).

INITIAL FLIGHT LEVEL.
TOW(t)	Optimum FL	Max FL
185 180 175 170 165 160 155 150 145 140 135 130 125 120	300 310 310 320 330 330 340 350 350 360 370 380 380 390	330 340 350 350 360 360 370 380 380 390 400 410 410 420

STEP CLIMB
Step climb to FL	Optimum GW (t) for start of step climb		Max GW (t) on top of climb
Step climb to FL	4000 ft step	2000 ft step	Max GW (t) on top of climb
430 420 410 400 390 380 370 360 350 340 330 320 310	- - 114 119 125 132 138 145 152 160 168 177 -	- - 109 115 120 127 133 139 147 154 161 169 177	116 121 127 133 140 147 154 162 170 178 No limit No limit No limit

OPTIMUM FLIGHT LEVEL vs STAGE LENGTH.

Valid for DC9.

Optimum FL vs Total distance(no wind, STD temp, normal cruise)

Valid for MD80/90.

Optimum FL vs Total distance(no wind, STD temp, normal cruise)

Valid for B767.