Rough Climb Over Pasco County
Partial power loss in a Piper Warrior on initial climb — carburetor ice, tank management, and a low-altitude decision at a forgiving field
The scenario
Departing Brooksville–Tampa Bay Regional Airport (KBKV), Brooksville, FL — Runway 09, climbing out on a 090° heading into Pasco County. Elevation 76 ft MSL. You are a Private pilot with roughly 180 hours total, current and proficient in the Piper Warrior (PA-28-161).
It is a warm, humid Florida morning in late spring: OAT 26°C, dew point 20°C, altimeter 29.94. Scattered clouds at 2,500 ft, light rain shower two miles to the northeast. Visibility 9 SM. The conditions are textbook for carburetor icing — warm, moist air, and you will be climbing through reduced power as you transition from takeoff to climb. The FAA icing probability chart marks these exact conditions as 'serious icing at glide power, moderate icing at cruise power.'
You are 350 ft AGL, climbing through 79 KIAS (Vy, best rate of climb), heading 090°, when the engine begins to run rough. Power is noticeably down — the tachometer is dropping. The off-field environment ahead (east of the runway) is open developed land (parks, large lots) and pasture — good forced-landing terrain. KBKV's tower is part-time (0700–2200 local) and is open; you are in Class D airspace.
Aircraft: Piper PA-28-161 Warrior, solo, fuel in the LEFT tank (you switched to LEFT after takeoff per your normal procedure), within limits. Carbureted Lycoming O-320-D, fixed-pitch prop, steam panel, fuel selector on LEFT. Nothing was written up; the airplane was airworthy at departure.
Pilot: you — a Private pilot, current, roughly 180 hours total. 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 heads-down on the climb and focused on the left-turn departure.
- {'label': 'Field', 'value': 'KBKV · Brooksville–Tampa Bay'}
- {'label': 'Runways', 'value': '3/21 · 9/27'}
- {'label': 'Elevation', 'value': '76 ft'}
- {'label': 'Aircraft', 'value': 'PA-28-161'}
- {'label': 'Dominant phase', 'value': 'Landing / Cruise'}
The decision
Before we get into the decision tree — what do you already know about carburetor ice in the PA-28-161 Warrior? (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 lost power progressively. The probable cause was carburetor icing in conditions conducive to serious icing, with a contributing factor of limited carburetor heat valve travel from recent maintenance. The pilot did not apply carburetor heat proactively.
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 probable causes were carburetor icing and the pilot's failure to use carburetor heat and maintain airspeed.
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 accident resulted from partial magneto failure caused by improper maintenance, with contributing factors including the instructor's failure to maintain airspeed and follow emergency procedures.
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 contexts — NOT at Brooksville–Tampa Bay Regional Airport. KBKV has its own accident history (see field dominant patterns: hard landings, forced landings, runway excursions), but these specific events happened elsewhere. The scenario is localized to KBKV 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. Off Runway 09 at KBKV, the off-field environment is open pasture and developed land — excellent forced-landing terrain. But the runway is still the best option if you can make it.
The PA-28-161's LEFT/RIGHT fuel selector (no BOTH position) is also a real risk: fuel starvation from not switching tanks is a Piper-class accident. In this scenario, you switched to LEFT after takeoff per your normal procedure — good airmanship. But if you had forgotten to switch, or if the LEFT tank had been empty, the symptom would be the same: roughness and power loss. Always confirm fuel selector position and tank quantity during the preflight and after takeoff.
Key lesson — In warm, moist Florida air, the PA-28-161's carbureted O-320-D 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, the decision window is measured in seconds — not minutes. Off Runway 09 at KBKV, the off-field environment is open pasture and developed land: a forced landing there is survivable. But the runway is still the best option if you can make it. Recognize the symptom early, apply carb heat immediately, and leave it on in conducive conditions.
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 Florida morning conditions at KBKV. 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-D 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 PA-28-161, 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.
At KBKV Runway 09, the off-field environment is open pasture and developed land — excellent forced-landing terrain.
The off-field environment off Runway 09's departure end (heading 090°) is open developed land (parks, large lots) and pasture. There is no water, no mountains, no unsuitable terrain. If the engine quits on the Runway 09 departure and altitude is insufficient to return to the airport, a forced landing in that terrain is survivable. This is not a worst-case scenario; it is a manageable emergency. Best glide is 73 KIAS. Doors unlatched before landing. Flaps for slowest possible touchdown speed — impact energy rises with the square of touchdown speed, so the slowest possible speed matters most. Know this before you line up on Runway 09.
The PA-28-161 has LEFT/RIGHT fuel selector — no BOTH position. Tank management is your job.
Unlike Cessnas (which have a BOTH position), the PA-28-161 requires you to manually switch tanks. Fuel starvation from not switching tanks is a Piper-class accident. Your normal procedure is to switch to LEFT after takeoff and monitor the fuel quantity. If you forget to switch, or if the LEFT tank is empty, the symptom is the same: roughness and power loss. Always confirm fuel selector position and tank quantity during the preflight, after takeoff, and periodically during cruise. A rough engine and dropping tachometer could be carb ice — or it could be fuel starvation. Check the fuel selector first, then apply carb heat.
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 Florida summer departure, with OAT near 26°C and dew point near 20°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 / stall), ERA14LA141 (2014 PA-28-161 partial power loss at takeoff), WPR10FA264 (2010 PA-28-161 in-flight fire), CHI08LA197 (2008 PA-28-161 aborted takeoff / overrun), IAD05LA133 (2005 PA-28-161 total engine failure), and DEN03LA139 (2003 PA-28-161 performance planning failure). Anonymized and localized to KBKV.
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.II.C — Takeoff and Climb
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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