The United States Federal Aviation Administration today issued a final airworthiness directive (AD) instructing operators of most Airbus A330 and A340 models to power down suspect air data inertial reference units (ADIRU) using one specific rotary dial on the panel.

The mandate follows EASA Emergency AD 2008-0225-E of December 18, 2008, which superseded EASA Emergency AD 2008-0203-E of November 19, 2008, issued after a Qantas Airways A330-300 pitched down unexpectedly while in cruise at flight level 370, seriously injuring 14 of the 303 passengers.

The Airbus A340 is also affected due to its cockpit similarity to the A330.

Read the directive here.

The Aviation Herald is reporting the European Aviation Safety Agency (EASA) has issued an updated Emergency Airworthiness Directive (EAD) 2009-0012-E following two incidents involving Qantas Airbus A330 and A340.

These incidents were attributed to Air Data Inertial Reference Unit #1 (ADIRU-1) providing erroneous data. The EAD recognizes additional failure modes, that have been discovered in the meantime.

EAD 2009-0012-E : Navigation – Air Data Inertial Reference Unit (ADIRU) – Operational Procedure, requires flight crews of the Airbus A330 and A340, who experience failures by one of the three ADIRUs on board of their aircraft not to limit their actions to turning off the affected ADIRU off, but to completely de-energize it under all circumstances by selecting the IR mode rotary to OFF.

A first EAD 2008-225-E had been issued on December 18th 2008 following an inflight upset of a Qantas Airbus A330-300 near Learmonth on Oct 7th 2008. During this event a faulty ADIRU-1 had transmitted randomly faulty data producing unjustified stall and overspeed warnings prompting the airplane's systems to pull the airplane into a dive. Disengaging the ADIRU did not stop the faulty ADIRU from transmitting such faulty data. The resulting EAD required the crews to verify, whether the disengagement of the ADIRU was followed by the OFF light to illuminate and in case of this light not appearing to de-energize the ADIRU.

A second incident occured to another Qantas Airbus A330-300 near Perth on December 27th 2008 leading to the disconnection of the autopilot, but without an inflight upset. The emergency directive now suggests, that the crew, following the first version 2008-225-E of the emergency directive received the OFF light for their ADIRU-1, however, the ADIRU-1 still did not disconnect and continued to supply faulty data.

The full Emergency Airworthiness Directive is available here.

Aviation Herald is reporting that

Transport Canada, the Canadian Ministry acting as Aviation Authority, have issued Airworthiness Directive (AD) CF-2008-33R1 on Jan 9th 2009, which addresses the issue of frequent flaps problems encountered on Canadair Regionaljets CRJ-100 and CRJ-200. The airworthiness directive was adopted by the European Aviation Safety Agency EASA on January 13th 2009.

The directive states: "An excessive wear condition was identified regarding end-play between the flap actuator and ball screw. Excessive wear of the screw and ball nut could potentially lead to a flap system jam."

The airworthiness directive replaces an earlier directive CF-2008-33, which had been issued on November 5th 2008.

The Aviation Herald had counted 16 incidents involving flaps problems on CRJ-200s during December 2008 and January 2009 (to date), which raised significant concerns, as stuck flaps produce higher landing speeds, increased required landing distances and thus pose additional risks.

The Aviation Herald asked Bombardier for comment on the flaps issue in early January, however received no reply to date.

In India, JetLite (formerly Air Sahara) operates seven CRJ-200.