Air India Flight AI171, a Boeing 787 Dreamliner bound for London Gatwick with 242 people aboard, crashed shortly after take-off from Ahmedabad. The Directorate General of Civil Aviation (DGCA) confirmed that the pilots of Air India Flight AI171 issued a "Mayday" distress call to Air Traffic Control (ATC) immediately after taking off from Ahmedabad's Sardar Vallabhbhai Patel International Airport (SVPIA). The pilots issued a "Mayday" distress call immediately after becoming airborne, indicating a grave emergency. However, no further communication was received, suggesting a sudden and catastrophic failure. The aircraft impacted a residential area near the airport, including a medical college hostel, resulting in fatalities both on board and on the ground. This marks the first fatal crash of a Boeing 787. Indian authorities have launched a full investigation to determine the cause of this tragic accident. This incident is a stark reminder of the critical role of the Mayday call in alerting authorities to severe in-flight emergencies and initiating immediate rescue and response efforts.
The DGCA has dispatched an investigation team to the crash site to determine the cause of the emergency and the subsequent crash. The "Mayday" call and the circumstances surrounding it will be crucial evidence in this investigation.
Significance of Mayday Call
The "Mayday" call signifies that the crew recognized a grave and imminent danger to the aircraft, its occupants, and potentially those on the ground, requiring immediate assistance. It's the highest level of emergency alert in aviation.
In aviation, a "Mayday" call serves as an internationally recognized distress signal utilized by pilots to indicate a life-threatening emergency that demands immediate assistance. It represents the most critical level of emergency notification.
How a Mayday Call Works
The term "Mayday" was introduced in the early 1920s by Frederick Stanley Mockford, a radio officer at London's Croydon Airport. He selected it as a phonetic rendition of the French phrase "m'aider" (pronounced "may-day"), which translates to "help me," ensuring clear communication during cross-channel exchanges. By 1923, it had become an established component of international radio communication for both pilots and mariners, and it was formally adopted in 1927 along with the Morse code distress signal "SOS."
Meaning and Importance
A Mayday call indicates that an aircraft or its occupants are in severe and imminent danger, necessitating urgent intervention to avert further escalation or potential loss of life. When a pilot issues a Mayday call, it takes precedence over all other radio communications on that frequency. All non-essential radio traffic must pause, and air traffic control (ATC) directs its full attention to the aircraft in distress.
The term "Mayday" is universally recognized as a distress signal in both aviation and maritime contexts, facilitating a quick and effective response from relevant authorities as well as nearby aircraft or vessels.
Situations Warranting a Mayday Call
Pilots use a Mayday call in critical situations such as - Engine failure (especially multiple engine failures or in critical phases of flight like take-off or landing)
Onboard fire or smoke
Significant structural damage
Loss of control of the aircraft
Critical medical emergencies requiring immediate landing
Any other scenario poses an immediate threat to the safety of the aircraft, crew, or passengers.
How a Mayday Call is Made (Procedure)
When a pilot issues a Mayday call, they typically say "Mayday" three times - "Mayday, Mayday, Mayday." This repetition is crucial to ensure the message is clearly understood, even in noisy or low-quality radio conditions.
After stating Mayday, the pilot identifies themselves with "This is [Aircraft Call Sign], [Aircraft Call Sign], [Aircraft Call Sign]."
The pilot then conveys key details to Air Traffic Control (ATC), which can include: - Aircraft identification (call sign) and type - Nature of the emergency (a brief description of the situation) - Current position (location, heading, altitude/flight level) - Pilot's intentions and requests (e.g., "requesting immediate landing," "diverting to nearest airport") - Number of people on board - Remaining fuel (in minutes, if relevant) - Any additional helpful information for rescue (e.g., injuries on board, weather conditions)
What Happens After a Mayday Call
Once a Mayday call is made, all other aircraft on the same frequency are expected to maintain radio silence to ensure clear communication between the distressed aircraft and ATC. ATC will prioritize the call, clear the airspace for the aircraft, and coordinate with emergency services (fire, medical, search and rescue) to prepare for the aircraft's arrival or to respond to a possible crash site. ATC will also provide the pilot with the necessary information and guidance to help manage the emergency effectively.
In cases of crashes or serious incidents, the Mayday call and the ensuing communications become essential evidence for investigators piecing together the sequence of events. It's important to differentiate between a "Mayday" call and a "Pan-Pan" call. A "Pan-Pan" indicates an urgent but non-life-threatening situation, such as a mechanical problem that doesn’t require immediate landing or a minor medical issue. In contrast, a "Mayday" is reserved for the most critical situations. Making a false Mayday call is considered a serious offense.