TOGA LOCK on Airbus: What It Is, Why It Happens, and How to Clear It

If you fly Airbus aircraft in the simulator with any seriousness, you will eventually see TOGA LK or TOGA LOCK on the flight mode annunciator after a go-around, a rejected landing, or sometimes after pressing TOGA at the wrong phase of flight. The message looks alarming but it is a deliberate Airbus protection: the flight guidance system is locking go-around thrust so the aircraft cannot silently reduce power while still in a critical energy state. Knowing why it appears and how to exit cleanly separates smooth go-around practice from confused throttle fighting.

What TOGA does

TOGA (Take-Off / Go-Around) is the priority pushbutton on the thrust levers or a guarded switch on the MCP/FCU area depending on model. Pressing it commands go-around thrust and engages the go-around vertical and lateral modes appropriate to the phase — for example SRS for pitch guidance and GA TRK or NAV for lateral track. On approach, TOGA is the correct response when a stable approach cannot be continued.

Why LOCK engages

After TOGA activation, autothrust (A/THR) drives engines toward the go-around N1 or EPR target. TOGA LOCK prevents the crew or the system from reducing thrust below that protected level until the logic is satisfied that the aircraft is safely climbing and the crew has intentionally taken over or selected a new mode. Without lock, an accidental thrust lever retard or mode change could bleed speed immediately after liftoff — dangerous near the ground.

Common sim triggers include: go-around from minimums, late TOGA after flare, TOGA pressed with autothrust active then manual lever movement fighting the system, or add-on bugs that leave A/THR in a latched state after touch-and-go.

What you see in the cockpit

• FMA shows TOGA LK or similar alongside SRS / GA TRK
• Thrust levers may feel “stuck” at high power unless moved deliberately
• ECAM may show A/THR related memos depending on aircraft software version
• Speed may increase quickly if pitch is not managed — fly the SRS target

How to clear TOGA LOCK correctly

Exact steps vary slightly between A320 CEO, NEO, and third-party sim models, but the philosophy is consistent:

1. Fly the go-around — positive rate, gear up per SOP, flaps incrementally retract on schedule.
2. At safe altitude (often acceleration altitude or per checklist), select desired vertical mode — CLB or OP CLB — and confirm navigation mode.
3. Move thrust levers from TOGA detent to the CLB detent (or MCT if your procedure specifies) to allow autothrust to arm thrust for climb.
4. Engage or confirm A/THR as required; TOGA LK should clear when the system recognizes thrust lever position and new mode.
5. If lock persists, check that speed is above green dot, flaps are not driving a protection, and no fault is active on ECAM.

In FBW A32NX, ToLiss, or Fenix, consult the specific go-around flowchart — some models require pulling speed brake, confirming FCU altitude, or pressing A/THR instinctively off then on.

Mistakes to avoid in the sim

• Retarding thrust immediately after TOGA while still below safe height
• Leaving flaps full while wondering why speed will not stabilize
• Ignoring FCU altitude — aircraft may level at go-around capture incorrectly
• Clearing lock by disconnecting everything without a plan — hand-fly only if trained for it

Practice one scripted go-around per session until TOGA LK clearing becomes automatic. Pair with NG ROUTE approach briefing so you have realistic altitude and QNH context before every ILS attempt.

Airbus procedures differ by operator and software version. Simulation only — verify against your aircraft add-on documentation.