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https://www.aviator-arif.com/2025/12/indigo-flight-crisis-2025.html?m=1

DGCA Grounds Select Airbus A320 Family Aircraft After Safety Alert

The Directorate General of Civil Aviation (DGCA) on Saturday (November 29, 2025) barred airlines from operating certain Airbus A319, A320, and A321 aircraft until urgent software or hardware modifications mandated under an Airbus safety alert are completed.

The directive comes after a recent incident on a JetBlue flight from Mexico to Newark on October 31, during which the aircraft briefly entered an uncontrolled descent lasting about 4–5 seconds before the autopilot corrected the flight path.

An investigation traced the issue to the Elevator and Aileron Computer (ELAC) — a key flight-control system that transmits commands from the pilot’s side-stick to the elevators on the aircraft’s tail. The elevators control the aircraft’s pitch or nose angle, making the malfunction a critical safety concern.

The DGCA has instructed airlines to comply with Airbus’ mandatory modifications before returning the affected aircraft to service.

*Good Morning Aviators*

👉 Session *4 of 2025*

_Demo class for *M-07, M-10, M-11+13 & M- 15* Will be start soon._

*Time & date*- Will inform in Demo Group.

👉 Interested for class Dm me for *joining demo group.*

Thanks & Regard
ARIF ALI ANSARI (AVIATOR-ARIF)

✈️️ *AI B787-8 / VT-ANB / Acccident* / 12 June 2025/ Summary

Engine Cutoff to Crash* Timeline Summary  (As per AAIB report) 🕒 *Total Elapsed Time: ~29 Sec*

📍 08:08:42 UTC

1. Aircraft reaches 180 knots IAS

2. *Both engine fuel switches set to CUTOFF (1 sec apart)* /Dual engine flameout begins. 

📍 08:08:47 UTC

1. RAT deployed, emergency hydraulic power active_ /begins losing altitude. 

📍 08:08:52 UTC

1. _*Engine 1 fuel switch set to RUN* Auto-relight initiated (signs of recovery). 

📍 08:08:54 UTC

1. APU inlet door opens, Auto-start triggered. 

📍 08:08:56 UTC

1. *Engine 2 fuel switch set to RUN* / Relight attempted, but fails to recover. 

📍 08:09:05 UTC

1. *Pilot call: “MAYDAY × 3 ”* / No response to ATC query. 

📍 08:09:11 UTC

FDR Recording ends _*Aircraft crashes*.

✈️️ The Captain demonstrated situational awareness under extreme time pressure.

Once the emergency was recognized, the crew acted swiftly: attempting engine relight, starting the APU, and declaring MAYDAY.

However, the available time — only 29 seconds — was too short to complete recovery, especially during takeoff when altitude was limited.

Their actions reflect professionalism and urgency, even in a situation with minimal margin for error.

*CDL stands for Configuration Deviation List.*

What is the CDL?

The Configuration Deviation List is a document provided by the aircraft manufacturer and approved by aviation authorities (like the FAA or EASA). It specifies which external parts of the aircraft may be missing or inoperative without affecting the aircraft's airworthiness for a specific period of time or under certain conditions.

Key Points:

Focus: The CDL focuses on external parts or fairings, such as:

Antenna covers

Landing gear doors

Access panel doors

Wingtips or flap fairings

Purpose: To allow operators to fly the aircraft safely and legally even with minor configuration deviations, avoiding unnecessary delays or groundings.

Conditions: Each item listed includes conditions and limitations for its absence, such as:

Speed or altitude restrictions

Increased fuel burn

Specific maintenance actions

Not to be confused with:

MEL (Minimum Equipment List): Focuses on inoperative systems or instruments inside the aircraft.

NEF (Non-Essential Furnishings): Covers inoperative cabin items that don’t affect airworthiness.

Example:

If a landing gear door fairing is damaged or missing, the CDL might say the aircraft can still fly if:

It is replaced within 10 days,

Fuel burn is increased by X%,

Certain speed limits are observed.

Let me know if you want to see an example CDL entry or compare it with MEL.

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✈️ 𝐀𝐕𝐈𝐀𝐓𝐎𝐑-𝐀𝐑𝐈𝐅 𝐑𝐓𝐑 𝐀 𝐃𝐄𝐌𝐎 𝐂𝐋𝐀𝐒𝐒𝐄𝐒 𝐅𝐎𝐑 𝐃𝐄𝐋𝐇𝐈 𝐒𝐄𝐒𝐒𝐈𝐎𝐍✈️

🎓 𝐈𝐧𝐬𝐭𝐫𝐮𝐜𝐭𝐨𝐫: Mr. Arif Ali Ansari
✅ AME B2 + B1 (All Modules) | RTR License Holder

📌 𝐀𝐩𝐩𝐥𝐢𝐜𝐚𝐛𝐢𝐥𝐢𝐭𝐲
🎯 Part-1 & Part-2 — AME Candidates 𝐎𝐧𝐥𝐲

🗓️ Validity: Until you pass your RTR exam

📢 𝐃𝐞𝐦𝐨 𝐒𝐞𝐬𝐬𝐢𝐨𝐧
📅 Date: Will be announced soon
⏰ Time: Shared in demo group

🛫 𝐖𝐡𝐚𝐭 𝐘𝐨𝐮’𝐥𝐥 𝐆𝐞𝐭:
✔️ Roadmap for RTR Exam Prep
✔️ Specific & Minimum Guidance to clear in 1st attempt
✔️ Highlighted Notes
✔️ Previous Years’ Paper Guidance
✔️ Phraseology + Call Practice

🌐 𝐖𝐞𝐛𝐬𝐢𝐭𝐞: www.aviator-arif.com

📞 7052915096 *WhatsApp*/ Join now & get ahead in your RTR journey!

𝐓𝐡𝐚𝐧𝐤𝐬 & 𝐑𝐞𝐠𝐚𝐫𝐝
Arif Ali Ansari (Aviator-Arif)

DME Antenna & Working on Airbus A320/321

📡 What is DME?

DME (Distance Measuring Equipment) is a radio navigation technology used in aircraft to determine the slant range distance between the aircraft and a ground-based DME station. It works in conjunction with VOR/DME or ILS/DME systems.

📌 DME Antenna Working Principle:

The aircraft's DME transceiver sends interrogation pulses to a DME ground station.

The ground station replies with reply pulses after a known fixed delay.

The aircraft measures the round-trip time between sending and receiving pulses.

Using the speed of radio waves, the system calculates the slant range (distance from aircraft to the station, not just horizontal).

🛩️ DME Antenna Position on Airbus A320/A321:

Aircraft Type: Airbus A320 Family (A318/A319/A320/A321)

The DME system uses dedicated antennas, typically blade-type, mounted on the lower fuselage.

The Airbus A320/321 usually has two DME antennas, connected to the aircraft's two DME receivers.

These antennas are often located near the centerline of the aircraft, aft of the nose gear bay and forward of the wing box.Key Characteristics:

Frequency range: 962–1213 MHz

Provides accurate distance within 0.1 nautical miles.

Operates independently of visibility conditions.

Typically used with VOR/DME or ILS/DME navigation aids.

The Airbus A320 family typically has:

🔹 Two DME Receivers

🔸 These are integrated as part of the VOR/DME receivers.

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📝 𝐕𝐇𝐅 𝐀𝐍𝐓𝐄𝐍𝐍𝐀𝐒 𝐎𝐍 𝐀𝐈𝐑𝐁𝐔𝐒 𝟑𝟐𝟎

The A320 typically has three VHF communication systems: VHF1, VHF2, and VHF3. These systems operate in the 118.000 to 136.975 MHz frequency range.
Location of VHF Antennas:

1. VHF1 Antenna:

Position: On the top of the fuselage (forward or mid-section).

Purpose: Primary radio for communication with ATC.

2. VHF2 Antenna:

Position: On the bottom of the fuselage.

Purpose: Used as a backup or for simultaneous comms (e.g., with ground).

3. VHF3 Antenna:

Position: Also on the top of the fuselage but farther back or in a separate location from VHF1.

Purpose: Often used for ACARS (Aircraft Communications Addressing and Reporting System) or data link communication.

4. Transmission & Reception

The aircraft’s radio transceiver sends modulated voice/data signals to the VHF antenna.

The antenna then radiates the RF signal outwards in all directions (omnidirectional pattern).

It also receives signals from ATC or other aircraft, which the transceiver demodulates for the pilot or for data systems.

5. Antenna Switching & Isolation

The antennas are isolated to avoid interference between VHF1, VHF2, and VHF3.

Systems ensure automatic switching or backup if a primary antenna fails.

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📝 Dark Cockpit concept and older cockpit philosophies

1. Older Cockpit Philosophy (Pre-Dark Cockpit)

Light = Status Indicator: Many lights were always on, even just to show a system was working (e.g., "Hydraulic Pump ON").

Cluttered Panels: Panels were filled with status lights, making it harder to distinguish normal from abnormal.

High Workload: Pilots had to interpret many lights and remember what "normal" looked like.

Example: A light saying “GEN 1 ON” would always be illuminated during normal flight, adding to visual noise.

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2. Dark Cockpit Concept (Modern, e.g., Airbus)

Light = Abnormal: Lights only come on if something is wrong or requires attention.

Dark = Normal: A completely dark overhead panel = all systems functioning correctly.

Streamlined Workflow: Aircraft systems are monitored automatically, and only exceptions are highlighted (via ECAM/ECIS).

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𝐒𝐞𝐥𝐜𝐚𝐥𝐥 (Selective Calling) is a system used in aviation and radio communications that allows a ground station to selectively call a specific aircraft without alerting others. It works by sending a series of audio tones, each representing a digit or character, unique to each aircraft.

Selcall Code: Key Points

A Selcall code is a 4-letter code (A–S) assigned to a specific aircraft.

Each letter corresponds to a unique audio tone.

Used on HF (High Frequency) or VHF radios in long-range communication.

Plays an audible alert in the cockpit when a call is received.

Example of a Selcall Code:

Selcall: ABFG
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*Selcall (Selective Calling)* is a system used in aviation and radio communications that allows a ground station to selectively call a specific aircraft without alerting others. It works by sending a series of audio tones, each representing a digit or character, unique to each aircraft.

📝 Selcall Code: Key Points

1. A Selcall code is a 4-letter code (A–S) assigned to a specific aircraft.

2. Each letter corresponds to a unique audio tone.

3. Used on HF (High Frequency) or VHF radios in long-range communication.

4. Plays an audible alert in the cockpit when a call is received.

Example of a Selcall Code:

Selcall: ABFG