What the FMA shows when TO/GA is selected with A/T Arm in ARM on a Delta 737

When TO/GA is selected and the A/T Arm is in ARM, the FMA shows GA for thrust while pitch stays in HOLD. The autothrottle assumes go-around thrust, but pitch guidance remains at the current attitude until a new climb target is commanded. This simple combo—GA with HOLD—is why that display appears.

When you flip TO/GA on a Delta 737 and the autothrottle arm sits in ARM, the Flight Mode Annunciator (FMA) doesn’t glow with a single, dramatic prompt. Instead, it presents a nuanced message: GA on the thrust side while the pitch side stays in HOLD. It’s a small but meaningful cue that tells the crew what the airplane is prioritizing and how it will behave in the climb.

Let me break down what’s happening and why this combination makes sense in a go-around context. The 737’s FMA is designed to show two things at once: thrust guidance and pitch guidance. Even though TO/GA is a go-around command, the aircraft doesn’t automatically tilt its nose upward the moment you press the button. Instead, it orchestrates a choreography between thrust and attitude, with the A/T system taking charge of the climb thrust while the pitch guidance remains steady until a new target is set or captured.

To understand the hold it maintains, it helps to think about the go-around as a deliberate, controlled redefinition of flight path. You’re telling the airplane, “We’re not cruising anymore; we’re climbing.” The ideal path is still being determined—whether you’ll settle on a comfortable climb rate, a reduced-angle ascent, or a steeper flight path for traffic or terrain reasons. The A/T Arm in ARM indicates that the system is ready to apply go-around thrust, but it isn’t forcing a fresh pitch target immediately. So the A/T system grabs the thrust side and goes GA, while the pitch side continues to keep its current attitude until a climb target is actively commanded or captured.

This is not a glitch in the matrix. It’s a deliberate design choice that helps the crew manage a high-workload situation smoothly. If you’re flying and you’re momentarily uncertain about the exact climb angle you want, you can rely on the engine power to do the heavy lifting while you fine-tune the attitude with pitch control. The FMA’s GA indication shows the thrust side is in go-around mode, and HOLD on the pitch side tells you you’re not yet committing to a new pitch attitude.

Let’s connect this to how it feels in the cockpit. Picture a scenario where a stabilized approach is scrubbed for some reason—perhaps wind shear, a displaced runway, or a need to circle for traffic. You flip TO/GA, and the airplane begins to throttle up in GA mode. You glance at the FMA and notice GA displayed on the thrust line, while the pitch line reads HOLD. The thrust is ramping, the engine N1 is climbing toward the target, and your current nose position is preserved for the moment. This buys you time to reassess the situation, reconfigure flaps, set the missed-approach altitude, and then, when ready, command a precise climb angle or attitude.

A deeper look at the anatomy of the FMA helps explain the behavior more clearly. The FMA is essentially a live map of two critical control loops: thrust and pitch. When TO/GA is selected, the system interprets the scenario as, “We’re transitioning to a climb with a defined thrust objective.” The A/T Arm being in ARM is an important flag—it means the autothrottle will command go-around thrust if you push the thrust levers forward. Yet, it won’t automatically impose a new pitch target unless you’re actively commanding one or the autopilot is capturing a climb-to attitude.

In practical terms, that means:

• GA on the thrust side: The autothrottle governs the climb thrust to meet go-around requirements. This ensures the airplane has adequate power to ascend and clear obstacles or weather, without the crew having to micromanage engine settings (at least not immediately).

• HOLD on the pitch side: The aircraft retains its current pitch attitude until you actively command a different climb angle or the flight control system locks onto a new pitch target. The result is a stable, predictable hands-off moment while you organize the rest of the go-around.

Why not an immediate pitch change? Because jumping straight to a new attitude can sometimes overshoot or create unnecessary oscillations in a high-workload moment. By keeping the current pitch, the flight deck retains a familiar and controllable baseline. Pilots can set flap configurations, gear, speed targets, and the missed approach point without fighting a sudden, aggressive nose-up command. It’s a micro-study in patience, but it pays off when you’re juggling several tasks at once.

A quick detour into how this compares with other modes on a similar airplane can be illuminating, too. Some other cockpits—or even different Boeing generations—might show a more aggressive push toward a new pitch target when TO/GA is engaged. On the 737 with A/T in ARM during TO/GA, the designers opted for a more conservative approach: trust the thrust to do the heavy lifting, while you hold the current attitude and decide the exact climb path. This minimizes surprises and gives pilots a clearer picture of the aircraft’s response to the go-around command.

How to interpret this in hands-on terms

• If you’re monitoring the FMA, expect to see GA on the thrust line and HOLD on the pitch line during a TO/GA event with the A/T Arm in ARM.

• The N1 limit is not the immediate focal point of the action here. It’s the thrust target that’s being managed by GA. The N1 display itself will reflect how close you are to the commanded thrust, but the immediate cue you’ll notice is the GA/STALL-free climb thrust decision, paired with hold on the attitude.

• If you want to shift to a steeper climb, you’ll typically bring the nose up or engage a vertical speed/ flight path angle target, and the FMA will update accordingly to reflect the new pitch and thrust targets.

A practical takeaway for pilots and enthusiasts

• Treat TO/GA with A/T ARM as a two-part instruction: “Let’s climb with go-around thrust” and “hold the current attitude until we decide on a precise climb target.” This is particularly important in busy airspace or when terrain or obstacles require a rapid but controlled response.

• Use this behavior to your advantage. The hold gives you a moment to configure the rest of the flight plan—adjust speed, verify flap settings, confirm missed approach altitude, and coordinate with ATC—without being forced into a precipitous pitch change.

• Remember that the FMA is a guiding instrument, not the sole navigator. The autopilot and autothrottle work in concert with your inputs. If you want a specific climb angle, you’ll set it via the flight controls or autopilot targets, and the FMA will reflect the updated combination of pitch and thrust as the system converges on the new path.

A touch of real-world flavor: managing expectations in the flight deck

Real-world operations often reward a calm, methodical approach to a go-around. The airplane’s response—GA on the thrust side with HOLD on pitch—helps keep the crew oriented. It means you’re not chasing two moving targets at once. The engine power is ready to push you uphill, and your attitude is momentarily anchored while you decide the best direction to head next.

That steady, deliberate tempo is a sign of good airmanship. When the air gets choppy or the runway becomes a blur of lights and instructions, the FMA’s paired signals provide a reliable map through the moment of transition. It’s not flashy, but it’s incredibly practical. In the end, you gain time to execute the missed approach or the go-around safely, with a clear path forward.

A final note on the mentorship behind these systems

The 737’s flight control logic reflects decades of experience—handling the balance between automation and pilot input in a way that supports safety and efficiency. The GA/holding behavior isn’t about hiding the human in the loop; it’s about giving you room to make deliberate, informed decisions at the critical moment when you’re choosing to go around or continue the approach. The FMA is doing the heavy lifting of information display, while you’re making the decisions that steer the airplane to its next phase of flight.

If you ever find yourself in a chatty briefing about FMA behavior, think of it as two tracks running in parallel: thrust and attitude. TO/GA with the A/T Arm in ARM doesn’t force a dramatic pitch change. It nudges the airplane into a safe, competent climb by prioritizing thrust while the crew settles on the right pitch target. That balance—GA on thrust, HOLD on pitch—remains a small but mighty heartbeat of the 737’s go-around workflow, quietly guiding the machine and the crew toward the next waypoint in the sky.