Gear Down and Locked — Or Is It?
Landing gear extension failure on approach to Zephyrhills Municipal — a complex-aircraft emergency with limited options
The scenario
Departing Zephyrhills Municipal Airport (KZPH), Zephyrhills, FL — Runway 19, a 5,072 ft asphalt runway on a clear, calm afternoon. Elevation 90 ft MSL. You are on a personal cross-country flight in a Piper Arrow PA-28R, a complex, retractable-gear aircraft with a constant-speed prop and fuel-injected Lycoming IO-360. Solo, full fuel, within limits.
You departed KZPH two hours ago, climbed to 4,500 ft MSL, and cruised at 120 KIAS. The flight has been uneventful. Weather is VFR throughout: clear skies, light winds, 10+ SM visibility. You are now on descent into KZPH for landing. The field is non-towered (Class G); you are on CTAF 122.8, announcing your position.
On downwind for Runway 19, at 1,200 ft AGL, you reduce power, trim for descent, and extend the landing gear. You hear the familiar electric whine of the gear motor and feel the slight pitch change as the gear doors open and the gear extends. You scan the three green lights on the gear indicator panel: nose gear, left main, right main. All three lights illuminate — gear down and locked.
You turn base at 900 ft AGL. Approach speed is 75 KIAS (Vref). You add 10° of flaps. The airplane is configured and stable. You are 2 nm from the runway threshold.
Then, as you roll out on final approach at 500 ft AGL, you notice something odd: the right main gear green light flickers — just for an instant — then comes back on. You blink. The light is steady again. But you saw it flicker. You scan the other two lights: nose and left main are steady green. Only the right main flickered.
Aircraft: Piper Arrow PA-28R, solo, full fuel, within limits. The airplane was last serviced three days ago for a 100-hour inspection; the landing gear system was inspected and serviced. The mechanic signed off on the airworthiness certificate. Nothing was written up.
Pilot: you — a Commercial pilot with roughly 600 hours total, 120 hours in the Arrow. You are current and proficient. You have never experienced a gear malfunction in this airplane. You are 400 ft AGL, 1.5 nm from the runway threshold, and you have a decision to make about what that flicker means.
- {'label': 'Field', 'value': 'KZPH · Zephyrhills'}
- {'label': 'Runways', 'value': '19/1 · 5/23'}
- {'label': 'Elevation', 'value': '90 ft'}
- {'label': 'Aircraft', 'value': 'PA-28R'}
- {'label': 'Dominant phase', 'value': 'Landing / Cruise'}
The decision
Before we get into the decision tree — what do you already know about landing gear malfunctions in the Piper Arrow? (Pick all that apply; this records your baseline.)
What the record shows
What the NTSB files show
NTSB CEN23LA417 (2023): A Piper PA-28RT-201 experienced partial retraction of the right main and nose landing gear during landing rollout. The pilot had landed with all three green lights illuminated, but the gear failed during the rollout. The cause of the partial retraction could not be determined despite extensive testing — but the green lights were not a reliable indicator of gear status.
NTSB WPR22LA040 (2021): A Piper PA-28R-200 had a right main landing gear that would not extend during approach. The pilot landed on the left main and nose landing gear. The investigation revealed that an improper right main landing gear door rod-end bolt had been installed during maintenance, preventing the landing gear from extending. The green light for the right main was not illuminated — but the pilot did not recognize the significance of the missing light until it was too late.
NTSB ERA15LA289 (2015): A Piper PA-28R-180 experienced an unsafe nose landing gear indication and performed emergency extension procedures. The accident resulted from undetected fatigue cracks in the nose landing gear strut mount assembly that prevented proper gear alignment after extension. The pilot landed, but directional control was lost during the landing rollout, and the airplane exited the runway. The green light was illuminated, but the gear was not properly aligned.
NTSB CEN11LA418 (2011): A Piper PA-28R-201 made a wheels-up landing after the landing gear power pack motor failed. The pilot did not use the emergency landing gear extension system. The investigation revealed that the emergency extension system was available and functional — the pilot simply did not use it. The wheels-up landing was survivable, but it caused significant damage and injury.
The consistent thread across all these events: the green lights in the Piper Arrow are necessary but not sufficient indicators of gear status. A flickering light, a missing light, or even all three lights illuminated does not guarantee that the gear is properly locked and aligned. The emergency landing gear extension procedure is the diagnostic tool that confirms mechanical soundness. Using it at altitude, before landing, is the correct response to any doubt about gear status.
The real accidents cited above occurred at other airports and in other Piper Arrow variants — NOT at Zephyrhills Municipal Airport. KZPH has its own accident history (see field dominant patterns), but these specific events happened elsewhere. The scenario is localized to KZPH to make the off-field environment real and consequential for you as a student here.
Key lesson — In the Piper Arrow, a landing gear light flicker at 400 ft AGL on final approach is a warning sign that demands action — a go-around and emergency extension to confirm gear status before landing. The green lights are necessary but not sufficient; they do not guarantee that the gear is properly locked or aligned. The emergency landing gear extension procedure is the diagnostic tool that confirms mechanical soundness. Use it at altitude, before landing, when you have any doubt about gear status. A wheels-up landing is survivable if executed correctly (slowest possible touchdown speed, master off before impact), but it is far better to diagnose and confirm gear status at altitude than to land with doubt.
Debrief — teaching points
The green lights are necessary but not sufficient.
The three green lights (nose, left main, right main) on the Piper Arrow gear indicator panel indicate that the gear position switches have detected the gear in the down position. They do NOT guarantee that the gear is properly locked, aligned, or mechanically sound. A flickering light, a missing light, or even all three lights illuminated can coexist with a mechanical failure — a loose electrical connector (CEN23LA417), an improper door rod-end bolt (WPR22LA040), or fatigue cracks in the strut mount (ERA15LA289). The lights are a necessary check, but they are not the final word on gear status.
A gear light flicker at low altitude on final approach is a warning sign that demands a go-around.
A single flicker of a gear light at 400 ft AGL on final approach is not normal. It indicates a potential electrical or mechanical issue. The correct response is an immediate go-around — climb away from the runway, gain altitude, and diagnose. You have time at altitude to execute the emergency extension procedure, visually inspect the gear, or divert to a facility with emergency services. You do not have time to diagnose at 400 ft AGL on final approach. A go-around is not a failure; it is airmanship.
The emergency landing gear extension procedure is the diagnostic tool.
The Piper Arrow has an emergency landing gear extension system (hand crank or CO2 cartridge, depending on the variant). This system is not just a backup for electrical failure — it is the diagnostic tool that confirms whether the gear is mechanically sound and can extend reliably. Execute the emergency extension at altitude (1,000 ft AGL or higher) when you have any doubt about gear status. If the emergency extension works and the lights come back on, you have confirmed that the gear is mechanically sound. If the emergency extension fails, you have confirmed that the gear is not safe to land on, and you should prepare for a wheels-up landing.
Cycling the gear at low altitude on final approach is high-risk and should be avoided.
Retracting and extending the gear at 400 ft AGL on final approach is a high-workload maneuver that destabilizes the approach and diverts your attention from flying the airplane. If you have doubt about gear status, execute a go-around first — climb to a safe altitude (800–1,000 ft AGL), then cycle the gear or execute the emergency extension. Never cycle the gear at low altitude on final approach.
A wheels-up landing is survivable if executed correctly.
If the gear cannot be extended and you must land with the gear retracted, a wheels-up landing is survivable if executed correctly. The key is the slowest possible touchdown speed — impact energy rises with the square of speed. Maintain Vref (75 KIAS) on final approach, flare to the slowest possible descent rate, and accept the longer landing distance. Turn the master switch off just before touchdown to reduce fire risk. Brace for impact. A wheels-up landing at 75 KIAS is far more survivable than one at 85 KIAS.
Off Runway 19 at KZPH, the off-field environment is marginal but landable.
The off-field environment off Runway 19's departure end (heading 180°) is marginal — mostly open developed areas (parks, large lots), evergreen forest, and low-density development. It is not ideal for a forced landing, but it is better than water or dense urban development. If you have an engine failure on the Runway 19 departure, you have options for a forced landing in the surrounding area. This is not a water-surrounded airport like some coastal fields; you have off-field options.
Built from the real accident record
Scenario built from NTSB CEN23LA417 (2023 PA-28RT-201 partial gear retraction during landing rollout), WPR22LA040 (2021 PA-28R-200 right main gear extension failure due to improper door rod-end bolt), ERA15LA289 (2015 PA-28R-180 unsafe nose gear indication and directional control loss), and CEN11LA418 (2011 PA-28R-201 wheels-up landing after failure to use emergency extension system). Localized to Zephyrhills Municipal Airport (KZPH).
NTSB reports: CEN23LA417 · WPR22LA040 · ERA15LA289 · CEN11LA418
ACS tasks: PA.I.F — Weather Information · PA.I.G — Cross-Country Flight Planning · PA.IX.C — Emergency Approach and Landing · PA.I.H — Human Factors · PA.II.D — Flight Controls / Landing Gear Systems · PA.III.B — Engine Management / Systems
Relevant FARs: §91.3 · §91.13 · §91.185
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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