Empty Side
A DA40 fuel selector, a forgotten tank switch, and an engine that quits on final at KZPH
The scenario
Field: Zephyrhills Municipal Airport (KZPH), Zephyrhills, FL — elevation 90 ft MSL. You are returning from a 1.8-hour cross-country and are on a 3-mile final for Runway 01, heading 360°. Non-towered, CTAF active, no traffic conflict. Class G airspace.
Aircraft: Diamond DA40, solo, within limits. You departed with full tanks — 50 gallons total, 24 usable per side. The DA40's fuel selector has two positions: LEFT and RIGHT. There is no BOTH. You set it to LEFT at engine start and never touched it again.
Weather: KZPH is clear, winds calm, visibility unrestricted. A beautiful Florida afternoon — the kind that makes you relax. Density altitude is near field elevation; performance is normal.
The situation: You are 3 miles out on final, gear fixed, flaps LDG, airspeed stabilizing toward 70 KIAS. The G1000 fuel quantity indication for the LEFT tank has been reading low for the last 20 minutes. You noted it, told yourself you'd switch tanks after landing, and kept flying. You are about to learn why that was the wrong call.
- {'label': 'Field', 'value': 'KZPH · Zephyrhills'}
- {'label': 'Runways', 'value': '19/1 · 5/23'}
- {'label': 'Elevation', 'value': '90 ft'}
- {'label': 'Aircraft', 'value': 'DA40'}
- {'label': 'Dominant phase', 'value': 'Landing / Cruise'}
The decision
On final, before anything goes wrong — which of these are actually in your head right now? (Pick all that apply; this records your mental state before the event.)
What the record shows
What the NTSB files show
Fuel starvation from improper tank management is a recurring, preventable accident type in aircraft with LEFT/RIGHT selectors — and the DA40 is squarely in that population. Unlike a Cessna 172 with a BOTH position, the DA40 requires the pilot to actively manage which tank is feeding the engine. There is no automatic equalization, no BOTH fallback.
NTSB case GAA19CA534 (Piper PA-28-161) is a near-exact analog: the pilot descended to land, the selected tank ran dry, the engine quit, and the pilot failed to switch to the tank containing usable fuel before attempting a forced landing on a road. The DA40 shares the same failure mode — a pilot who monitors the EIS indication, notes it is low, and decides to deal with it after landing is making a bet that the tank has more residual fuel than it does.
NTSB case ERA17LA205 (Cessna P206) documents the same pattern on approach: the pilot ran one tank to exhaustion during a post-maintenance flight, the engine quit on approach, and the airplane landed in trees short of the runway. The approach phase is the worst possible time for an engine failure — low altitude, high drag configuration, limited options.
NTSB case DFW05CA087 (Cessna TU206G) adds the preflight dimension: the pilot did not visually verify fuel quantity before departure and relied on gauges alone. The G1000 EIS in the DA40 is more accurate than legacy analog gauges, but the principle is unchanged — visual verification of fuel quantity in each tank during preflight is the first line of defense.
The real events in these cases occurred at airports other than KZPH. The DA40-specific lesson is this: the fuel selector is a pilot-managed system with no BOTH position and no automatic protection. The EIS is telling you the truth. Act on it before the engine does.
Key lesson — The DA40 fuel selector has no BOTH position — LEFT and RIGHT are the only options, and an empty selected tank means engine failure. A low fuel indication on the G1000 EIS is not a suggestion; it is a countdown. Switch tanks proactively, before the engine makes the decision for you.
Debrief — teaching points
The DA40 fuel selector has no BOTH — the pilot IS the system.
The Lycoming IO-360-M1A in the DA40 feeds from whichever tank the selector points to — LEFT or RIGHT. There is no BOTH position, no automatic crossfeed, no fallback. When the selected tank empties, the engine stops. This makes proactive tank management a non-negotiable discipline: plan your switch point before flight, execute it before the tank is empty, and verify the switch on the G1000 EIS. A low fuel indication on the EIS is not a gauge quirk — it is a warning with consequences measured in minutes.
The approach phase is the worst time for an engine failure.
Engine failures on approach combine low altitude, high drag (flaps extended), reduced airspeed margin, and limited options for off-field landing. The DA40's best glide is 73 KIAS — in landing configuration with flaps LDG, drag is significantly higher and glide ratio is reduced. A fuel starvation event that would be manageable at cruise altitude becomes a survival situation at 400 ft AGL on final. The time to switch tanks is during cruise or descent, not on final approach.
Best glide is 73 KIAS — pitch for it immediately, do not pull the nose up.
After an engine failure, the instinct to raise the nose to 'stretch the glide' is wrong and potentially fatal. Raising the nose bleeds airspeed without extending range — it trades kinetic energy for a momentary altitude gain that immediately converts back to a steeper descent. The DA40's best glide is 73 KIAS at gross weight. Pitch for it immediately, trim, and then work the restart checklist. Pulling above best glide speed reduces glide distance and, at low altitude, risks a stall with no altitude to recover.
Full flaps in a forced landing: the primary value is the slowest touchdown speed.
Impact energy rises with the square of touchdown speed — halving the speed reduces impact energy by 75%. In a forced landing, full flaps (flaps LDG) deliver the slowest possible touchdown speed, which is the dominant factor in occupant survivability. The steeper approach angle is secondary. If the glide is marginal and flaps are reducing your range, retracting them is a legitimate trade-off — but if you are going to land off-field regardless, keeping flaps LDG to minimize touchdown speed is the correct priority.
Visual fuel verification at preflight is the first line of defense.
The G1000 EIS fuel quantity indication is more accurate than legacy analog gauges, but it is not a substitute for visually verifying fuel quantity in each tank during preflight. Fuel caps can be loose, tanks can be misfueled, and quantity can be less than expected. The DA40 has a fuel drain under each wing root — drain and verify. Dip the tanks if there is any doubt. The EIS is a monitoring tool; the preflight visual check is the verification. NTSB DFW05CA087 is a direct example of what happens when a pilot trusts gauges and skips the visual check.
Built from the real accident record
Composite scenario built from NTSB cases WPR24LA167, GAA19CA534, DFW05CA087, and ERA17LA205 — fuel starvation events in single-engine piston aircraft. Real events occurred at other airports; anonymized and adapted for DA40 systems.
NTSB reports: WPR24LA167 · GAA19CA534 · DFW05CA087 · ERA17LA205
ACS tasks: PA.II.A — Pilot Qualifications / Preflight Preparation · PA.II.B — Weather Information · PA.II.C — Cross-Country Flight Planning · PA.IX.C — Emergency Approach and Landing · PA.I.H — Human Factors
Relevant FARs: §91.3 · §91.13 · §91.151
Step through the full decision tree, make the calls, and see where each choice leads — then debrief it with your CFI.
Open the interactive scenario →All sample scenarios · More Diamond DA40 scenarios · More scenarios at KZPH