Dry Tank
Fuel mismanagement, a silent engine, and the DA40's LEFT/RIGHT selector
The scenario
Field: Tampa Executive Airport (KVDF), Tampa, FL — elevation 22 ft MSL. You are inbound from a 1.4-hour cross-country, entering a left downwind for Runway 23, heading 222°. Non-towered, CTAF 123.0. Class G below 3,000 ft MSL; Tampa Class B begins at 3,000 ft MSL overhead.
Aircraft: Diamond DA40, N-number yours, solo, within limits. Full fuel was verified at departure — or so you thought. The DA40 has a LEFT/RIGHT fuel selector with no BOTH position. You departed on the LEFT tank and have been cruising on LEFT for the entire flight. You never switched.
Weather: VMC, clear, calm winds, visibility unrestricted. Density altitude near field elevation — no performance penalty. A perfect Florida afternoon.
Pilot: you — a Private pilot, ~150 hours, about 60 in the DA40. You fly this airplane regularly and consider the fuel system routine. That familiarity is exactly the hazard.
- {'label': 'Field', 'value': 'KVDF · Tampa Executive'}
- {'label': 'Runways', 'value': '5/23 · 18/36'}
- {'label': 'Elevation', 'value': '22 ft'}
- {'label': 'Aircraft', 'value': 'DA40'}
- {'label': 'Dominant phase', 'value': 'Landing / Takeoff'}
The decision
On left downwind for Runway 23, before you reach the abeam point — which of these is actually in your head? (Pick all that apply; no wrong answers.)
What the record shows
What the NTSB files show
The three seed accidents in this scenario — ERA12FA002 (Temco Swift, Chesapeake Bay, 2011, fatal), ANC17LA043 (Cessna T207, Alaska, 2017), and LAX98LA168 (Cessna T210M, Santa Barbara, 1998) — all share the same probable cause language: fuel starvation resulting from improper fuel selector management. In each case, fuel was aboard the aircraft. The engine stopped because the selected tank was empty and the pilot either did not know which tank was selected or did not switch in time.
These accidents did NOT occur at Tampa Executive Airport. They are presented here because the mechanism — fuel starvation from a mis-set or unmonitored fuel selector — is directly applicable to the Diamond DA40 at KVDF.
The DA40's LEFT/RIGHT selector (no BOTH position) makes this failure mode particularly accessible. A pilot who departs on LEFT and never switches will run that tank dry in approximately 1.5–2 hours at cruise power. The G1000 fuel quantity display is a cross-check, not a primary measurement — it can lag or misread. The only reliable verification is a visual/dipstick check at preflight and disciplined tank switching in flight.
The off-field environment at KVDF matters: off the departure end of Runway 23 (heading 222°) is mostly pasture and open areas — a survivable forced landing zone. Off the north end of Runway 36 (heading 360°) is open water and medium development — a ditching scenario. Which environment you end up in after an engine failure on downwind is determined almost entirely by how quickly you fly the airplane toward Runway 23 versus how long you wait.
Key lesson — The DA40 has no BOTH position. Fuel starvation from a single unmonitored tank is not a theoretical risk — it is a documented fatal accident pattern. Verify actual fuel quantity in each tank at preflight, confirm selector position at run-up, and switch tanks on a disciplined schedule in flight. After an engine failure, best glide (73 KIAS) and fuel selector to the other tank are the first two memory items — in that order.
Debrief — teaching points
The DA40 has no BOTH — tank management is an active pilot task.
Unlike a Cessna 172 (which uses a BOTH selector), the Diamond DA40 requires the pilot to actively choose LEFT or RIGHT. There is no position that draws from both tanks simultaneously. A pilot who departs on one tank and never switches will exhaust that tank in roughly 1.5–2 hours at cruise power — with fuel still aboard in the other tank. Build a tank-switching schedule into every flight plan: switch at a defined time interval (e.g., every 30 minutes) or at a defined fuel quantity. Brief it before engine start; execute it in flight.
G1000 fuel quantity is a cross-check, not a measurement.
The G1000 displays fuel quantity from the aircraft's fuel quantity sensors. These sensors can lag, stick, or misread — particularly at low fuel levels. The NTSB has cited unreliable fuel quantity indicators as a contributing factor in multiple fuel starvation accidents (ANC17LA043 is one example). The only reliable fuel quantity measurement is a visual check or dipstick at preflight. Know the actual fuel aboard before you start the engine; use the G1000 display to monitor trends, not as the sole source of truth.
After an engine failure: aviate first, then troubleshoot.
The first action after an unexpected engine silence is to pitch for best glide — 73 KIAS in the DA40. Not a MAYDAY call, not a fuel selector check, not a look at the G1000. Pitch for 73 KIAS. Then run the memory items: fuel selector to the other tank, boost pump ON, mixture RICH. The MAYDAY call comes after the airplane is flying the best glide profile. Aviate, navigate, communicate — in that order, every time.
Know your off-field environment before you need it.
At KVDF, the off-field environment is not uniform. Off the departure end of Runway 23 (heading 222°) is mostly pasture and open areas — a good forced landing zone. Off the north end of Runway 36 (heading 360°) is open water, wooded wetland, and medium development — a ditching scenario. A pilot who knows this before engine start can make faster, better decisions after an engine failure. Study the NAIP aerial and NLCD land-cover data for your home field. Know where you would go from each runway end and each position in the pattern.
A partial restart on short final is not a go-around trigger.
An engine that surges once and goes quiet again on short final at 200 ft AGL is not a reliable go-around engine. Advancing the throttle on an unreliable powerplant at that altitude — with the DA40's slippery composite airframe already committed to the landing — trades a survivable landing for an uncontrolled impact. The rule: if you are low on final with an unreliable engine, land the airplane on the available surface. A go-around requires a reliable engine, altitude, and airspeed. If any of those are absent, land.
Built from the real accident record
Composite scenario built from NTSB ERA12FA002, ANC17LA043, and LAX98LA168 — fuel starvation events in single-engine aircraft. Localized to KVDF / Diamond DA40. Anonymized.
NTSB reports: ERA12FA002 · ANC17LA043 · LAX98LA168
ACS tasks: PA.II.A — Pilot Qualifications / Systems Knowledge · PA.IX.C — Emergency Approach and Landing · PA.I.H — Human Factors · PA.II.B — Preflight Inspection
Step through the full decision tree, make the calls, and see where each choice leads — then debrief it with your CFI.
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