FAA issues Airworthiness Directive: AD 2021-14-08 on A319-151N, A319-153N, A319-171N, A320-251N, A320-252N, A320-253N, A320-271N, A320-272N, A320-273N, A321-251N, A321-251NX, A321-252N, A321-252NX, A321-253N, A321-253NX, A321-271N, A321-271NX, A321-272N and A321-272NX airplanes based on EASA AD No. : 2021-0150 dated 21st June 21.
An increasing number of operational disruptions have been reported, due to airspeed discrepancies.
Prompted by investigations performed as part of continuous development, computational simulations identified that the occurrence of ‘consistent erroneous airspeed indications’ (which stands for 2 or 3 pitot probes delivering erroneous speed information within the same speed range) on A320neo family may affect the aeroplane’s response, in particular during the rotation phase.
This condition, if not corrected, could lead to an unstable flight path after take-off, possibly resulting in reduced control of the aeroplane.
Both the ADs (EASA and FAA) require :
► Affected Operators / airlines to apply appropriate protection measures when an aeroplane is parked or stored (even for short periods of time), and to follow recognised manufacturer’s procedures to check the Air Data Probes prior to return to service after such parking/storage.
►AD also requires Pilots reinforcing the airspeed check during the take-off phase and providing instructions to abort take-off in case of unreliable airspeed situation is detected, This Compliance to be done through an amendment of the applicable AFM by incorporating the AFM TR.
►Operators must also implement an MMEL TR, requiring that the Integrated Standby Instrument System (ISIS) Airspeed Indication must be operative.
For Details on Action, Pls refer : EASA AD No.: 2021-0150 , FAA AD 2021-14-08 .
To address this potential unsafe condition, Airbus Operators Information Transmission (OIT) 999.0048/20, Airbus Operational Training Transmission (OTT) 999.0025/21, and Airbus Flight Operations Transmission (FOT) 999.0020/21) to remind to apply appropriate protection measures when an aeroplane is parked or stored (even for short periods of time),
And Operators to follow recognised manufacturer’s procedures to check the Air Data Probes prior to return to service after such parking/storage.
Airbus issued the AFM TR, reinforcing the airspeed check during the take-off phase and providing instructions to abort take-off in case of unreliable airspeed situation is detected, and the MMEL TR, requiring that the Integrated Standby Instrument System (ISIS) Airspeed Indication must be operative.
Airbus also issued FOT 999.0042/21 and RED Operations Engineering Bulletin (OEB) 59, providing reinforced aeroplane speed check instructions during take-off.
This airworthiness directive (AD) becomes effective July 1, 2021.
Source - FAA , EASA .
Picture for representation .
