Descent to Final — Airspeed Decay in the Turn

Departing Tampa International Airport (KTPA), Tampa, FL — Runway 19R, a full-stop landing approach on a warm afternoon. Elevation 26 ft MSL. You are on downwind, 800 ft AGL, heading 002°, cleared to land on Runway 19R. The tower has issued a spacing request: 'Slow to best approach speed and maintain a shallow descent on base; traffic on short final.'

It is a typical Florida afternoon in late spring: OAT 32°C, light and variable winds (2–4 kt), altimeter 29.92. Scattered cumulus at 3,500 ft. Visibility 10 SM. The air is smooth but thermally active — the kind of afternoon when the ground is heating and updrafts are common. Density altitude is approximately 2,200 ft.

You are flying the Cirrus SR20 solo, within weight and balance limits, full fuel. The glass panel (Avidyne PFD) is displaying airspeed, altitude, and attitude clearly. You have 180 hours total time, 60 hours in the SR20. This is your third full-stop landing of the day.

Aircraft: Cirrus SR20, fuel-injected Continental IO-360-ES, constant-speed prop, fixed gear, glass panel. Best glide is 96 KIAS. Approach speed (Vref, full flaps) is 80 KIAS. Stall speed clean is 65 KIAS; stall speed landing (full flaps) is 56 KIAS. The SR20 is not certified for intentional spin recovery by control inputs — CAPS (the whole-airframe parachute) is the primary response to an unrecoverable spin or loss of control at adequate altitude.

Pilot: you — a Private pilot, current, 180 hours total, 60 in type. You have not experienced a stall or spin in the SR20. You are focused on the spacing request and making a smooth approach. You have not explicitly briefed the minimum safe airspeed for the base-to-final turn, and you are not actively monitoring the airspeed trend.

NTSB WPR20LA152 (2020, FATAL): A Cirrus SR20 on a cross-country flight stalled during a steep descending turn to final approach at low altitude. The pilot exceeded the aircraft's critical angle of attack, and the parachute was deployed too late to inflate before impact. The probable cause was the pilot's failure to maintain adequate airspeed during the steep and descending turn to final approach. This accident occurred at a different airport — NOT at KTPA — but the mechanism is identical to the scenario above: a tight turn to final at low altitude with decaying airspeed.

NTSB ERA23FA358 (2023, FATAL): A Cirrus SR20 student pilot on a solo night flight impacted trees during initial climb after the fourth takeoff of the evening. The accident was attributed to spatial disorientation (somatogravic illusion) and the pilot's failure to maintain a positive climb rate. While this accident occurred in climb (not approach), the underlying factor — loss of situational awareness and failure to monitor the attitude indicator — is the same: a pilot who is not actively scanning the instruments and maintaining control.

NTSB GAA19CA099 (2018): A Cirrus SR20 on a training flight stalled during a go-around when the student pilot aggressively pitched up after being instructed to abort the landing. The accident resulted from the student pilot's exceedance of the critical angle of attack during the go-around and the flight instructor's delayed remedial action. This accident shows that the stall risk is not limited to the approach — it extends to the go-around, where a student may over-pitch in an attempt to climb quickly.

Regional precedent NTSB SEA07CA125 (2007): A Cessna 170B stalled during the base-to-final turn when the pilot allowed airspeed to become too low. The pilot attempted recovery but the aircraft 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 and collision with terrain. This accident, in a different aircraft, shows the consistent pattern: base-to-final stall at low altitude is a recurring accident type across many aircraft types.

Regional precedent NTSB CHI89DET01 (1988, FATAL): A Volksplane VP-1 in local traffic pattern at approximately 300 ft AGL stalled while turning downwind with a nose-high attitude and slow airspeed, entered an incipient spin, and struck the ground in an inverted attitude. The accident resulted from a stall with insufficient altitude for recovery. This accident, in a different aircraft and at a different airport, shows the same mechanism: a stall in the pattern at low altitude with insufficient altitude for recovery.

The real accidents cited above occurred at other airports and in some cases other aircraft — NOT at KTPA. KTPA's own accident history (see field dominant patterns) shows that LOSS_OF_CONTROL_INFLIGHT and LOSS_OF_CONTROL_GROUND are significant accident categories. The off-field environment at KTPA is dense development on all runway ends — a forced landing in that environment is a CFIT (Controlled Flight Into Terrain) accident. The scenario is localized to KTPA to make the off-field reality consequential: a stall on final approach to Runway 19R means impact in dense Tampa development, not a field landing.

The consistent thread across all these events: the base-to-final turn is the most dangerous turn in the pattern. Airspeed is already low, the load factor is high, and altitude is minimal. A stall at this point is unrecoverable. The SR20's CAPS is a last-resort tool — it is not a substitute for airspeed management and stall recognition. Prevention is the only option: maintain Vref (80 KIAS) on final, avoid steep banks (keep bank angle less than 15° on base and final), and recognize the stall warning horn as an immediate signal to lower the nose and level the wings.