I agree that an inop APU is a real pain the ass BUT in the MD
-11 an inop fuel qty. gauge on the synoptic display causes all sorts of headaches especially if it's a long leg to fly. I've copied a PORTION of the MEL
requirements for a SD
gauge inop here and deleted about 80% just to show the more important items.
-11 Minimum Equipment List
A 3 2 (O) (M) One may be inoperative provided:
a) Fuel Quantity Synoptic indications for
the remaining two tanks are operative,
b) All engine Fuel Flow Indications are
c) All engine Fuel Used Indications are
d) Affected tank is fueled to a known
e) Fuel Quantity in affected tank is
checked by Fuel Level Sticks after each
f) The flight does not require fuel dumping
for the enroute engine out driftdown
g) All Fuel Pumps and (Main) Fill Valve in
the affected tank are operative,
h) Fuel System Controller is operated in
the Manual Mode,
ik) When aircraft’s intended track takes it
farther than 120 minutes from a suitable
airport and trip reserve fuel is less than
23,000 lbs., add a maximum of 5,300
lbs. of fuel or until reserve fuel equals
l) Number 2 Main Tank Fuel Transfer Float
Switch (40K) is operative,
m) Tip Tank Gravity Transfer System for
affected tank is operative,
n) Tip Tank Full Float Switch for affected
tank is operative,
q) If MTOGW is 630,500 lbs and Aux Tank
quantity exceeds 9,000 lbs, comply with
ground fuel schedule of 100 lbs. Tail
Tank fuel per 750 lbs. Aux Tank Fuel.
1. Tail Fuel Management is inoperative.
2. Associated Overhead Panel Indication may be inoperative.
NOTE:If the associated Overhead Display is rendered blank by this MEL
, it is NOT necessary to
document relief for the Overhead Display.
3. “FUEL QTY FAULT” Alert may display.
4. If Tank 2 Fuel Quantity is inoperative, the "TNK 2 FUEL QTY LO
" Alert is inhibited.
5. Gross Weight, Aircraft CG, and Total Fuel On Board will not display.
6. FMS Fuel Dump to Gross Weight function will not be available.
7. In the event of a fuel dump, fuel quantity as indicated on the FMS will be in error by the amount of fuel
dumped. Recalculate Usable Fuel On Board (UFOB) and enter into FMS Weight INIT Page for accurate
8. Fuel Dump Low Level Cutoff is still available.
9. The FMS may limit aircraft speed to approximately 320 kts.
NOTE:DO NOT use this speed for dispatch and flight planning calculations.
NOT conduct operations above 78° N Latitude.
3. Operate FSC in MANUAL.
CAUTION:On Preflight, verify all FSF calculations using the FSF Verification Module of the
8. Periodically check fuel quantity in affected tank by subtracting fuel used and quantities in other tanks
from initial fuel quantity on board.
9. Fuel burn is increased by 2.7%.