Aircraft Type: B757-200    Engines: RR RB 211

Pretitle: RH engine bleed failure.

Precis: EICAS 'AOA Probe Heat' warning following engine start. After the circuit breaker was pulled and reset, the fault did not recur. During the climb, flight crew and cabin crew noted a strong acrid smell. After reaching cruise height, EICAS indicated the RH engine bleed had shut down. In-flight return to the departure airport initiated. Both recirculation fans turned off, resulting in the cabin altitude increasing and the altitude warning illuminating. Two cabin crew members became ill. Three unsuccessful attempts made to reinstate the failed bleed system. Oxygen masks used by all crew on board. RH engine thrust reverser failed to operate and 'Forward Equipment Overheat' warning activated during landing.

CAA Closure: During investigations, equipment cooling fan filters were inspected and fan operation tested satisfactorily with no signs of overheat. High power engine ground runs were completed and the operation of engine bleed was found to be normal. Following a second occurrence, (EICAS indicated 'Engine Bleed Off'), the nr2 engine PRSOV (Pressure Reducing Shut Off Valve) was replaced, having been identified as the cause. It was also reported that the AOA probe warning and failure of the RH engine thrust reverser. These were unrelated defects, which initially were not reported by the pilot via Tech Log entries. Additional and separate actions were taken to close these defects and to remind flight crew of their obligations with regards to the reporting of defects. In addition, the forward equipment overheat warnings were the result of the recirculation fans being switched off during the event.  Once reset, the warning was extinguished.

Aircraft Type: EMB-190 Series  200  Engines: GE CF34

Pretitle: MAYDAY declared due to burning smell within the a/c.

Precis: During final descent cabin crew informed flight deck of a burning smell within the cabin. At the same time the smell became apparent in the flight deck. ECL consulted which confirmed decision to declare MAYDAY. On short finals, EICAS 'Pack 2 Fail' and 'Pack 2 Off' annotated. Normal landing undertaken with fire service in attendance. Engineers subsequently confirmed ACS pack had become unserviceable.

Aircraft Type: A320-200  Engines: CFM 56

Pretitle: MAYDAY declared on ground due to smoke in cabin and cockpit

Precis: Whilst a/c on stand during boarding, cabin crew informed flight crew of the presence of smoke and a burning smell in the cabin, which also became present in the cockpit. Decision to disembark passengers during which intermittent ECAM 'Smoke fwd cargo' illuminated. MAYDAY declared for fire service attendance. After a/c disembarked, cargo hold checked for presence of smoke, none found and MAYDAY downgraded. During the disembarkation, the crew had difficulties contacting the fire service. During the investigations, multiple failures began to occur including TRIM air faults, engine fire loop fault, cargo vent fault and NAV IR 2 fault amongst others. The APU oil cooler was found leaking into air intake, which caused the smoke.


Aircraft Type: A320-200  Engines: IAE V2500

Pretitle: Fumes in flight deck and cabin.

Precis: An acrid oil smell had been reported during the previous four sectors while in descent. Possible oil overfilling considered as a cause. On the outbound sector however, an acrid smell noted during descent when the engines were at idle thrust. On the subject flight, diversion initiated. At approximately FL200 during descent, the smell recurred, being markedly worse than before. Flight crew reported burning eyes, "thick heads" and an oil taste in the mouth. QRH for smoke/fumes actioned and the fumes immediately cleared.
CAA Closure: Investigation by the operator revealed that the APU oil system was empty with oil migrating from the front bearing. APU failure is cited as the root cause and cause of the fume event. APU subsequently removed for repair and investigation. APU subsequently replaced.