Rough Climb Over Tampa North
Partial power loss in a Piper Warrior on initial climb — carburetor ice, fuel management, and a low-altitude decision in Class G airspace
The scenario
Departing Tampa North Aero Park Airport (X39), Tampa, FL — Runway 14, climbing out on a 141° heading. Elevation 68 ft MSL. You are a Private pilot with 180 hours total time, current and proficient in the Piper Warrior (PA-28-161). This is a local flight — you know the airplane and the field.
It is a warm, humid Florida afternoon in late spring: OAT 29°C, dew point 23°C, altimeter 29.91. Scattered clouds at 2,500 ft, light rain shower one mile to the northeast. Visibility 8 SM. The conditions are classic Gulf Coast — warm, moist air, exactly the environment the FAA icing probability chart marks as 'serious icing at glide power, moderate icing at cruise power.' The Lycoming O-320 in the Warrior is carbureted; carburetor ice is a real threat.
You are 350 ft AGL, climbing through 79 KIAS (Vy — best rate of climb), heading 141°, when the engine begins to run rough. Power is noticeably down — the tachometer is dropping. The off-field environment ahead (climb-out from Runway 14) is medium development, low-density development, and wooded wetland — not ideal for a forced landing, but not water. You are in Class G airspace (non-towered CTAF). No tower, no ATC — you are on your own.
Aircraft: Piper PA-28-161 Warrior, solo, full fuel (36 gallons usable), within limits. Carbureted Lycoming O-320-D, fixed-pitch prop, steam/vacuum panel, fuel selector on LEFT tank (you switched to LEFT after takeoff per normal procedure). Nothing was written up; the airplane was airworthy at departure.
Pilot: you — Private pilot, 180 hours total, current. You did not apply carburetor heat during the run-up because the engine ran smoothly. You did not apply it after takeoff because you were focused on the climb and did not anticipate carb ice in these warm conditions.
- {'label': 'Field', 'value': 'X39 · Tampa North Aero Park'}
- {'label': 'Runways', 'value': '14/32'}
- {'label': 'Elevation', 'value': '68 ft'}
- {'label': 'Aircraft', 'value': 'PA-28-161'}
- {'label': 'Dominant phase', 'value': 'Takeoff / Landing'}
The decision
Before we get into the decision tree — what do you already know about carburetor ice in the Piper Warrior (PA-28-161)? (Pick all that apply; this records your baseline.)
What the record shows
What the NTSB files show
NTSB CEN12LA175 (2012): A Piper PA-28-161 on an instrument instructional flight encountered carburetor ice during climb through 6,500 feet. The engine ran rough and lost power. A contributing factor was limited carburetor heat valve travel from recent maintenance — the heat valve could not open fully, preventing maximum carb heat application. The probable cause was carburetor icing in conditions conducive to serious icing.
NTSB LAX03LA238 (2003): A Piper PA-28-161 experienced partial engine power loss during initial climb from Torrance due to carburetor icing. During a go-around attempt, the pilot failed to maintain adequate airspeed, resulting in a stall and collision with power lines and terrain. The pilot did not apply carburetor heat and did not maintain airspeed during the aborted landing.
NTSB CHI05LA226 (2005, FATAL): A Piper PA-28-161 on an instructional flight from Culver, Indiana, lost engine power due to left magneto failure during initial climb after takeoff and subsequently stalled. The flight instructor failed to maintain airspeed and follow emergency procedures. Improper maintenance by company personnel resulted in the magneto failure.
NTSB ERA14LA141 (2014): A Piper PA-28-161 experienced partial engine power loss during takeoff from Atlantic City International Airport and the pilot executed a forced landing to the airport perimeter road. The accident resulted from a partial loss of engine power for reasons that could not be determined during postaccident examination or engine test run.
The real accidents cited above occurred at other airports and in other aircraft — NOT at Tampa North Aero Park (X39). X39 has its own accident history (see field dominant patterns: LOSS_OF_CONTROL_INFLIGHT 27.3%, LOSS_OF_CONTROL_GROUND 18.2%), but these specific NTSB events happened elsewhere. The scenario is localized to X39 to make the off-field environment real and consequential for you as a student here.
The consistent thread across all these events: carburetor ice in the PA-28-161 is insidious. It builds gradually, the first symptom is roughness and a dropping tachometer (not a dramatic power cut), and by the time it is obvious, it may be too late for a comfortable recovery. The fix — full carburetor heat, immediately, at the first sign of roughness in conducive conditions — is simple. The failure is always a delay. In the Warrior, the fuel selector (LEFT / RIGHT, no BOTH) is also your responsibility — tank management is not automatic. Know which tank you are on and why.
Key lesson — In warm, moist Gulf Coast air, the PA-28-161's carbureted O-320 can accumulate serious carburetor ice even at cruise power and above-freezing temperatures. Apply full carburetor heat at the first sign of engine roughness or unexplained RPM loss. At low altitude (350 ft AGL), the decision window is measured in seconds — not minutes. The off-field environment off Runway 14 at X39 is medium development and wooded wetland: poor for a forced landing, but better than water. Know your fuel selector position (LEFT or RIGHT) and be ready to manage tanks. Early recognition and immediate full carb heat is the lesson.
Debrief — teaching points
Carburetor ice forms in conditions you would not expect.
The FAA icing probability chart shows 'serious icing at glide power' at temperatures between roughly 20°C and 30°C when relative humidity is high — exactly the Gulf Coast afternoon conditions at X39. You do not need visible ice, freezing temperatures, or IMC. Warm, moist air at reduced power is the classic carb-ice environment. The PA-28-161's Lycoming O-320 is carbureted; it has no fuel injection, no alternate air system. Carburetor heat is the only tool.
The first symptom is subtle — a dropping tachometer and engine roughness.
In a fixed-pitch airplane like the Warrior, carburetor ice first shows as engine roughness and an unexplained RPM decrease. There is no dramatic power cut. Pilots who are not actively monitoring the tachometer miss the early warning. By the time the roughness is obvious, significant ice has accumulated. Scan the tachometer as part of your regular instrument scan, especially in conducive conditions.
Apply full carburetor heat — not partial — and expect an initial RPM drop.
When you apply carb heat to an iced carburetor, the RPM will drop further before it rises. This is expected and normal: the heat is melting ice and the resulting water is briefly disrupting combustion. Do not remove carb heat when the RPM drops — that is the heat working. Hold it full on. The RPM will recover as the ice clears, typically within 15–30 seconds depending on ice accumulation. Partial carb heat can worsen the situation by partially melting ice into water ingestion without fully clearing the restriction.
The Warrior's fuel selector is LEFT / RIGHT with NO BOTH position — tank management is your job.
Unlike some aircraft, the PA-28-161 does not have a BOTH position. You must actively switch tanks to manage fuel. Fuel starvation from not switching tanks, or from selecting a tank with contaminated fuel, is a real failure mode. Know which tank you are on and why. In this scenario, you switched to LEFT after takeoff per normal procedure — but if the LEFT tank had been contaminated or the pickup blocked, a fuel selector switch to RIGHT would have been the correct response. Always consider fuel management as a possible cause of engine roughness.
At X39 Runway 14, the off-field environment is medium development and wooded wetland — poor but not water.
The off-field environment off Runway 14's departure end (heading 141°) is medium development, low-density development, and wooded wetland. This is not ideal for a forced landing, but it is better than open water. A forced landing in this terrain is survivable if you fly it correctly: best glide at 73 KIAS, flaps for slowest possible touchdown speed, master off just before impact. Impact energy rises with the square of touchdown speed — the slowest possible speed matters most.
Proactive carb heat use in conducive conditions is not optional.
The PA-28-161 POH and the FAA Pilot's Handbook of Aeronautical Knowledge both recommend applying carburetor heat when conditions are conducive to icing — before the symptom appears. In a Gulf Coast summer departure, with OAT near 29°C and dew point near 23°C, that means applying carb heat during the run-up check (and confirming the expected RPM drop, then recovery) and considering its use during climb in visible moisture or high humidity. Waiting for the roughness to appear at 350 ft AGL is waiting too long.
Built from the real accident record
Scenario built from NTSB CEN12LA175 (2012 PA-28-161 carburetor ice during climb), LAX03LA238 (2003 PA-28-161 carb ice + stall on go-around), CHI05LA226 (2005 PA-28-161 magneto failure on climb), ERA14LA141 (2014 PA-28-161 partial power loss at takeoff), and related PA-28-161 precedents. Localized to Tampa North Aero Park Airport (X39), Tampa, FL.
NTSB reports: CEN12LA175 · LAX03LA238 · CHI05LA226 · ERA14LA141 · WPR10FA264 · CHI08LA197 · IAD05LA133 · DEN03LA139
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.B — Engine Starting / Systems Preflight · PA.V.B — Power-Off Stalls · PA.V.C — Power-On Stalls
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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