The Turn to Final
Base-to-final stall in a light, responsive trainer — altitude is unforgiving, and the pattern is over dense development
The scenario
Departing Tampa International Airport (KTPA), Tampa, FL — Runway 19L, a full-stop landing approach in the local pattern. Elevation 26 ft MSL. It is a clear, VFR afternoon: scattered clouds at 3,500 ft, light winds from 180° at 4 knots, visibility 10 SM. The pattern altitude is 1,000 ft AGL (1,026 ft MSL). You are on downwind, 1.5 nm from the field, descending toward base.
Aircraft: Diamond DA20-C1, solo, 1,700 lb gross weight, within limits. Continental IO-240-B fuel-injected engine, fixed-pitch prop, fixed gear, steam panel. Best glide 73 KIAS. Stall speed (landing configuration) 36 KIAS. Approach speed (short final) 55 KIAS. The airplane is light, responsive, and floats in ground effect — it is sensitive to pitch and bank changes, especially at low airspeed.
Pilot: you — a Private pilot, current, roughly 120 hours total. About 30 hours in the DA20. You have done this pattern many times. The tower has cleared you for a full-stop landing on Runway 19L. You are on downwind, descending, and about to turn base.
Off-field environment: KTPA is surrounded by dense development — residential, commercial, and industrial areas. The off-field environment off Runway 19L's climb-out (heading 182°) is poor: mostly dense development, medium development, and pasture/hay. There is no open field, no park, no water. An engine failure or loss of control in the pattern over this terrain means a forced landing into a built-up area — power lines, roofs, trees, streets. The pattern is over the city.
Tower clears you to turn base. You roll into the turn at 1,000 ft AGL, descending, airspeed 70 KIAS. The turn is tighter than you expected — you are trying to make a short base to avoid a long final over the development. As you roll out on base, you notice the airspeed is dropping: 68, 66, 64 KIAS. You are still descending, still turning slightly toward final. The runway is ahead and below.
- {'label': 'Field', 'value': 'KTPA · Tampa'}
- {'label': 'Runways', 'value': '10/28 · 19L/01R · 19R/01L'}
- {'label': 'Elevation', 'value': '26 ft'}
- {'label': 'Aircraft', 'value': 'DA20'}
- {'label': 'Dominant phase', 'value': 'Landing / Takeoff'}
The decision
Before we get into the decision tree — what do you already know about stall/spin risk in the base-to-final turn in a light trainer like the DA20? (Pick all that apply; this records your baseline.)
What the record shows
What the NTSB files show
NTSB WPR09FA062 (2008, FATAL): A Diamond DA20-C1 on a solo instructional flight near Alamo Lake State Park, Arizona, experienced loss of control during a maneuver and descended into terrain. The probable cause was the pilot's failure to maintain control during the maneuver and failure to recover from the subsequent aerodynamic stall and spin. The airplane was at low altitude; recovery was not possible.
NTSB CHI89DET01 (1988, FATAL): A Volksplane VP-1 in the local traffic pattern at approximately 300 ft AGL stalled while turning downwind with a nose-high attitude and slow airspeed. The airplane entered an incipient spin and struck the ground in an inverted attitude. The probable cause was a stall with insufficient altitude for recovery.
NTSB SEA07CA125 (2007): A Cessna 170B on a full-stop landing approach stalled during the base-to-final turn when the pilot allowed airspeed to become too low. The pilot attempted recovery, but the airplane impacted a field adjacent to the airport. The probable cause was the pilot's failure to maintain adequate airspeed during the turn, resulting in an inadvertent stall.
NTSB ERA10CA300 (2010): A Piper PA-18-135 stalled and entered a spin during a climbing right turn on final approach when the pilot attempted to perform a 360-degree turn per ATC spacing request. The probable cause was the pilot's failure to maintain adequate airspeed during the climbing turn.
The common thread: all of these accidents occurred in the base-to-final turn or on final approach at low altitude. The stall warning came too late, or the pilot ignored it. The altitude was insufficient for recovery. KTPA's pattern is over dense development — residential, commercial, and industrial areas. An uncontrolled descent into that terrain is fatal. The real accidents cited above occurred at other airports — NOT at KTPA. But the geographic reality at KTPA (dense development off all runway ends) makes the consequences equally severe.
The DA20 is a responsive, light trainer. It is sensitive to pitch and bank changes. Airspeed can decay rapidly if pitch attitude is allowed to rise or bank angle is increased without adding power. The stall warning horn is an early warning — it sounds at approximately 5–10 knots above stall speed. It is not a last-second alarm. If you hear it, you have time to add power and lower the nose. If you ignore it, you do not.
Key lesson — In the base-to-final turn at KTPA, maintain a descent rate of 300–500 fpm and airspeed no lower than 55 KIAS (approach speed). If airspeed decays below 55 KIAS or the stall warning horn sounds, immediately add power and lower the nose — go-around. At 1,000 ft AGL, there is very little margin for stall recovery. The pattern is over the city; an uncontrolled descent is fatal. The go-around is not a failure — it is the correct decision.
Debrief — teaching points
Airspeed decay in the base-to-final turn is the stall precursor.
The base-to-final turn is where most stall/spin accidents occur in the pattern. The turn requires a change in bank angle and pitch attitude. If you increase the bank angle without adding power or reducing pitch, the airplane will slow down. The DA20 is light and responsive — airspeed can decay from 70 KIAS to 58 KIAS in 10–15 seconds. Monitor the airspeed indicator continuously during the turn. If airspeed drops below 55 KIAS (approach speed) or continues to decay, add power immediately.
The stall warning horn is an early warning, not a last-second alarm.
The DA20's stall warning horn sounds at approximately 5–10 knots above stall speed (36 KIAS in landing configuration). If you hear it, you have time to add power and lower the nose. You do not have time to debate or ignore it. The horn is telling you that the stall is imminent. Respond immediately: add power, lower the nose, and climb away (go-around) or level the wings and add power (if you are not in a turn). Do not tighten the turn or pull back harder — that will accelerate the stall.
At 1,000 ft AGL in the pattern, there is very little altitude margin for stall recovery.
A developed spin requires 500–1,000 ft AGL to recover, depending on the airplane and the pilot's skill. If you stall at 900 ft AGL, you may not have enough altitude to recover. The incipient spin (wing drop, nose pitch-down) can develop into a developed spin in seconds. The only safe action is to avoid the stall entirely: maintain airspeed above 55 KIAS, keep the wings level, and descend at a controlled rate. If the stall warning sounds, go-around immediately.
The go-around is not a failure — it is the correct decision.
If the approach is unstable, if airspeed is decaying, or if the stall warning sounds, the correct action is a go-around: add full power, lower the nose to maintain airspeed, level the wings, and climb away. The go-around is a normal part of flying. It is better to go around and set up again than to force a landing and risk a stall. KTPA's tower will clear you for another approach. There is no penalty for a go-around.
KTPA's pattern is over dense development — an uncontrolled descent is fatal.
The off-field environment off Runway 19L's climb-out (heading 182°) is poor: mostly dense development, medium development, and pasture/hay. There is no open field, no park, no water. An engine failure or loss of control in the pattern means a forced landing into a built-up area — power lines, roofs, trees, streets. The pattern is over the city. Maintain control and airspeed at all times. If you lose control, you will impact the development. There is no alternate landing surface.
Built from the real accident record
Scenario built from NTSB WPR09FA062 (2008 DA20 stall/spin loss of control), GAA19CA527 (2019 DA20 stall during takeoff), ERA16LA282 (2016 DA20 loss of control during go-around), and local-environment precedents FTW91DRG06, SEA07CA125, CHI89DET01, ERA10CA300. Real events occurred at other airports — NOT at KTPA.
NTSB reports: WPR09FA062 · GAA19CA527 · ERA16LA282 · FTW91DRG06 · SEA07CA125 · CHI89DET01 · ERA10CA300
ACS tasks: PA.II.D — Approach and Landing · PA.II.E — Go-Around / Rejected Landing · PA.IX.C — Emergency Approach and Landing · PA.I.H — Human Factors · PA.VIII.A — Stall / Spin Awareness
Relevant FARs: §91.3 · §91.13 · §91.119
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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