What should a crew do immediately when an EGPWS 'PULL UP' warning activates?

The crew must execute the maximum-performance escape maneuver immediately without hesitation: the PF simultaneously advances thrust to maximum (TOGA) and rotates aggressively to the target pitch attitude (typically 20–25 degrees nose up or per the AFM), while the PM confirms the warning verbally and monitors engines. Do not delay to assess whether the warning might be false — terrain clearance comes first, investigation comes after.

What is the difference between an EGPWS caution and an EGPWS warning?

An EGPWS caution (amber) indicates a predicted terrain conflict approximately 60 seconds ahead and requires immediate crew assessment and likely initiation of an escape maneuver. An EGPWS warning (red, 'TERRAIN TERRAIN PULL UP') indicates a conflict within approximately 30 seconds and mandates an immediate escape maneuver with no delay for analysis. The warning leaves no time for deliberation.

Why is CFIT considered a crew resource management problem and not just an avionics problem?

CFIT consistently results from breakdowns in situational awareness, monitoring, communication, and crew coordination rather than from equipment malfunction — AC 61-134 emphasizes this explicitly. Even aircraft fully equipped with EGPWS have been involved in CFIT accidents when crews failed to respond correctly, lacked shared terrain awareness, or did not communicate assertively. Strong CRM practices — including sterile cockpit discipline, Threat and Error Management briefings, and empowered monitoring — are the primary barriers against CFIT before any warning system ever activates.

Controlled Flight Into Terrain Prevention and EGPWS Escape Maneuvers

Controlled Flight Into Terrain (CFIT) occurs when an airworthy aircraft, under full crew control, is inadvertently flown into terrain, water, or an obstacle — most often without the crew ever realizing the threat until it is too late. Unlike structural failures or engine malfunctions, CFIT accidents happen because of a breakdown in situational awareness, not because the airplane stopped flying. That distinction makes CFIT a human factors problem as much as a navigation or systems problem, and it is precisely why Crew Resource Management (CRM) principles are inseparable from any serious treatment of terrain avoidance.

The Enhanced Ground Proximity Warning System (EGPWS), combined with crew training, standardized escape maneuvers, and robust CRM practices, forms the modern defense-in-depth against CFIT. For the Airline Transport Pilot (ATP) candidate, understanding the why and how of each layer — the threat, the technology, and the human response — is both an oral-exam requirement and a career-long safety imperative.

Understanding CFIT: The Threat Model

CFIT accidents share a recognizable anatomy. Typically the crew is task-saturated, operating in instrument meteorological conditions (IMC), conducting an approach or descent, and either unaware of their precise position relative to terrain or distracted by another problem. Contributing factors catalogued in FAA Advisory Circular AC 61-134 include inadequate crew coordination, breakdown of crew monitoring duties, failure to cross-check published minimums, and over-reliance on automation without maintaining positional awareness. The accident chain usually involves multiple latent failures that each seem minor in isolation.

High-risk phases of flight for CFIT are the approach and landing phase (particularly non-precision approaches in mountainous or unfamiliar terrain), departure and initial climb, and en-route descent. Low crew workload combined with complacency is just as dangerous as high workload combined with fixation — both degrade monitoring. AC 61-134 specifically emphasizes that effective CRM — including assertive communication, shared mental models, and cross-verification — is the primary procedural barrier against CFIT before any warning system activates.

GPWS and EGPWS: How the Technology Works

The original Ground Proximity Warning System (GPWS) was a reactive system that used radio altimeter data, barometric altitude rate, and gear/flap position to detect dangerous proximity to terrain. It was excellent at warning when an airplane was already in a dangerous configuration close to the ground, but it had a fundamental limitation: it could not see what was ahead. A crew flying level at 5,000 feet toward a 6,000-foot mountain ridge in clear air would receive no warning until seconds before impact.

The Enhanced Ground Proximity Warning System (EGPWS) — sometimes called a Terrain Awareness and Warning System (TAWS) — adds a forward-looking terrain awareness capability. EGPWS integrates GPS position data with an onboard worldwide terrain and obstacle database, then computes a projected flight path and compares it against the terrain ahead. This creates two new classes of alerts:

Caution (Amber): The system predicts terrain conflict within approximately 60 seconds. Crews receive an aural and visual advisory such as "TERRAIN AHEAD" or "CAUTION TERRAIN." The appropriate response is to immediately assess the situation and begin an escape maneuver if the caution cannot be immediately resolved.
Warning (Red): The system predicts terrain conflict within approximately 30 seconds. Aural warnings include "TERRAIN TERRAIN, PULL UP" or "PULL UP." The escape maneuver must begin immediately without hesitation or debate.

EGPWS also retains the classic GPWS Mode alerts (Modes 1 through 7), which cover excessive sink rate, excessive terrain closure rate, altitude loss after takeoff, unsafe terrain clearance in certain configurations, excessive below-glide-slope deviation, and wind shear. The combination of predictive TAWS capability and reactive GPWS modes makes EGPWS a comprehensive terrain protection system, but it is not a substitute for crew awareness — database errors, unusual obstacles, and very steep terrain can still produce short warning times.

The EGPWS Escape Maneuver: Standardized Immediate Action

When an EGPWS WARNING (red, "PULL UP") activates, the correct crew response is a standardized, maximum-performance escape maneuver. There is no time for extended analysis. The procedure is driven by a fundamental principle: assume the warning is valid until terrain clearance is confirmed. The consequences of responding to a false warning — a brief period of high pitch attitude and full power — are operationally recoverable. The consequences of hesitating on a valid warning are not.

The standard EGPWS escape maneuver, as described in manufacturer guidance consistent with AC 61-134 CRM principles, proceeds as follows:

Simultaneous crew action — Pilot Flying (PF): Disconnect the autopilot (if time permits and not counterproductive), simultaneously advance thrust levers to maximum (go-around) thrust, and aggressively rotate to a wings-level climb attitude. The target pitch attitude for most transport-category aircraft is approximately 20–25 degrees nose up, or the pitch required to achieve best-angle/maximum obstacle-clearance climb performance — as specified in the aircraft's AFM/QRH. The maneuver is flown to the stick shaker if necessary; do not sacrifice climb performance to avoid activating the stall protection system if terrain clearance demands it.
Simultaneous crew action — Pilot Monitoring (PM): Call out "PULL UP, EGPWS" to confirm recognition, monitor the engine instruments, call out any airspeed or attitude deviations, and handle radio communications. The PM must not distract the PF from flying the maneuver.
Configuration: Once established in the climb, retract flaps to the go-around/climb setting per the AFM/QRH escape procedure, since the appropriate climb flap setting improves climb gradient — leaving the aircraft in a high-drag landing configuration is what degrades climb performance. Gear retraction likewise follows the manufacturer's escape-maneuver sequence rather than being delayed indefinitely.
Bank angle: Maintain wings-level or minimum bank. If a turn is absolutely necessary to avoid terrain, it must be coordinated and limited to the shallowest angle that achieves clearance, because bank angle reduces the vertical component of lift and degrades climb rate.
Continue the maneuver: Do not level off or reduce pitch until the EGPWS warning ceases AND visual or instrument confirmation of terrain clearance is established. Many CFIT accidents have involved crews who responded initially but then relaxed the maneuver before clearance was confirmed.

CRM's Role in CFIT Prevention

AC 61-134, General Aviation Controlled Flight Into Terrain Awareness, frames CFIT prevention squarely within a CRM context. The document emphasizes that CFIT is not simply a technology problem and that equipping an airplane with EGPWS does not guarantee safety if the crew lacks the discipline, communication skills, and situational awareness to use the system correctly. Key CRM behaviors that directly reduce CFIT risk include:

Shared situational awareness: Both crew members must maintain an active mental model of terrain, obstacle, and minimum safe altitude environment — not just the pilot flying. The PM must be empowered and expected to call out deviations.
Assertive communication: Any crew member who suspects terrain proximity must speak up immediately using standard callouts, even if it means challenging a captain. CRM training scenarios should rehearse these interventions until they become automatic.
Sterile cockpit discipline: Non-essential conversation during critical phases of flight diverts attention and increases the probability of missing early CFIT cues.
Automation management: Over-reliance on the flight management system (FMS) or autopilot without monitoring the actual flight path against terrain is a well-documented CFIT precursor. Crews must periodically cross-check programmed routes against published charts and terrain depictions.
Briefings and threat identification: Before conducting approaches into unfamiliar or mountainous terrain, crews should brief minimum safe altitudes, terrain proximity, escape route options, and the trigger points for go-arounds. This pre-mission threat identification is a core element of Threat and Error Management (TEM), which AC 61-134 incorporates into its CFIT prevention framework.

Key Numbers and Rules

EGPWS caution alerts predict terrain conflict in approximately 60 seconds of flight time.
EGPWS warning alerts predict terrain conflict in approximately 30 seconds of flight time — immediate escape maneuver required.
Escape maneuver target pitch: typically 20–25 degrees nose up (aircraft-specific; always reference the AFM/QRH).
Thrust: Maximum available (go-around/TOGA) simultaneously with pitch input.
Bank angle during escape: wings level or minimum required; each 30 degrees of bank costs roughly 13% of climb performance.
14 CFR Part 121.354 and Part 135.154 mandate TAWS (Class A or B) for applicable air carrier and commuter aircraft — EGPWS compliance is a regulatory requirement, not optional equipment.
Minimum Terrain Clearance Altitude (MTCA) and Minimum Safe Altitude (MSA) depictions on approach charts are the crew's primary procedural terrain references before EGPWS activates.

Common Test Traps

Hesitation on a "PULL UP" warning: Exam scenarios often present a false-alarm possibility to see if the candidate will delay the escape maneuver. The correct answer is always to execute immediately — false alarms are investigated after terrain clearance, not before.
Confusing caution and warning response: A caution (amber) requires immediate assessment and likely a maneuver; a warning (red) requires immediate escape — no assessment delay. Test writers exploit this distinction.
Gear/flap retraction during the escape: Many students reflexively assume all configuration changes must be frozen. In fact, the standard AFM/QRH escape procedure calls for retracting flaps to the appropriate climb setting once established in the climb, since remaining in a high-drag landing configuration degrades climb performance; this should not be confused with recklessly cleaning up the aircraft outside the specified sequence.
Attributing CFIT solely to equipment failure: CFIT is predominantly a human factors accident. Answers that focus only on avionics upgrades without addressing CRM, monitoring, and communication will be marked incomplete by an examiner.
Forgetting the PM's role: The escape maneuver is a two-crew event. Candidates who describe only PF actions miss that the PM must make the confirm callout, monitor engines, and manage communications — a CRM failure in itself.