Airbus AS 350 Series Floor Mounted Control Quadrant
Airbus AS 350 Series Floor Mounted Control Quadrant HazardsThe Airbus AS 350 series is a popular helicopter (also known as an “AStar” or a “Squirrel”) that is usedthroughout Alaska for a variety of missions involving carrying passengers. Some of these missionsinclude commercial operations (aerial photography, glacier treks, heli-mushing, heliskiing/snowboarding, construction, etc.), public use, and natural resource industry support (oil, gas,mining, forestry, etc.).Figure 1. An Airbus AS 350 conducting apinnacle approach in remote mountainousterrain.The floor mounted control quadrant is a design found only on the Airbus AS 350 series (AS350 B, AS 350BA, AS 350 B1, and AS 350 B2). Some AS 350 B3 models have the main rotor brake lever and theemergency fuel shutoff lever mounted on the floor with the fuel flow control lever (FFCL) removed and atwist-grip throttle mounted on the collective instead. The control quadrant levers are susceptible tointerference from passengers and objects, which can result in inadvertent movement of the controlsand cause a loss of engine power. Methods to prevent this interference are described in the passengerbriefing supplement provided with this Safety Briefing (located at https://www.aasfonline.org).Operators and pilots should consider printing and laminating the supplement and carrying it with thepassenger briefing cards in the helicopter. Have each passenger review the supplement before eachflight. This is an optional, free aviation safety educational resource, with unlimited copying anddistribution permitted.Page 1 of 5
Operators of the Airbus AS 350 series, right seat pilot drive configuration, should consider installing asafety guard to help protect the control quadrant from interference. This safety guard is installed via aFederal Aviation Administration (FAA) approved supplemental type certificate (STC) process or fieldapproval process. If the safety guard doesn’t provide adequate interference protection from the left sideand above, consider installing an acrylic plastic shield on top of the safety guard. For left seat pilot driveconfiguration, consider installing an acrylic plastic shield on the left side of the control quadrant toprevent interference. Placard the acrylic plastic shields with caution wording to communicate theinterference danger to passengers. Contact your local FAA Flight Standards District Office for assistanceand any necessary approval to install safety guards and acrylic plastic shields. This best safety practice ofusing a safety guard along with an acrylic plastic shield is incorporated by several AS 350 operatorsthroughout Alaska.Figure 2. An installedexemplar safety guard(right seat pilot driveconfiguration), with anattached exemplar acrylicplastic shield and cautionwording, viewed from thecabin.Page 2 of 5
Figure 3. An installed exemplar safetyguard (right seat pilot driveconfiguration), with an attached exemplaracrylic plastic shield and caution wording,viewed from the left side of the cockpit.Commercial operators and public use organizations should be familiar with this safety issue, and provideeducation to management, pilots, mechanics, and ground crew personnel to enhance safety awareness.If animals are carried onboard the helicopter, they should be secured from movement near the controlquadrant. Specific information should be included in the company’s operations manual about passengerbriefing requirements, passenger loading and unloading procedures, passenger en route procedures,and object securing procedures that address the prevention of interference with the control quadrant.Pilots who fly AS 350 series helicopters should ensure passengers are adequately briefed on thepotential to inadvertently move the various control quadrant levers and should use extreme cautionwhen loading and unloading passengers and during en route procedures. All objects should be safelysecured in the helicopter. All seat belt assemblies for the front passenger seat should always be securedwhen not in use and not left dangling loose.Passengers who fly in AS 350 series helicopters should be aware of the potential to inadvertently movethe various control quadrant levers. Passengers should understand that all body parts and objects mustPage 3 of 5
always be kept away from this critical safety area, and ensure all objects are properly secured prior toflight. Examples of objects that could interfere with the control quadrant levers include camera straps,backpacks, purses, clothing articles, electronics cords, tools, ski/snowboard equipment, mountaineeringequipment, tactical equipment, etc.If an object is dropped anywhere in and around the control quadrant (such as a cellular phone, pen, tool,camera lens, etc.), the passenger should not reach for the item but should immediately alert the pilotabout the dropped item. Objects dropped inside the control quadrant gate plate have the potential ofcausing jamming with the levers.If an interference event occurs, and you feel this was due to the inference susceptibility of the controlquadrant design, report the event to the FAA via a Service Difficulty Report (https://avinfo.faa.gov/sdrx/). FAA Advisory Circular (AC) 20-109A “Service Difficulty Program” states that, “anyreport can be very constructive in evaluating design or maintenance reliability.”Accident Case References:1. ERA18MA099 (N350LH, 2018, aerial photography flight) – A 5-person fatal injury Airbus AS 350B2 accident near New York, New York, where the pilot reported that during an engine failureand autorotative sequence, he realized the emergency fuel shutoff lever was in the off position.He further reported that he noted that a portion of a passenger’s tether was underneath theemergency fuel shutoff lever. A rollover occurred during the emergency water neratorFile.ashx?EventID 20180311X13013&AKey 1&RType Prelim&IType MA2. ANC08FA053 (N213EH, 2008, passenger flight) – A 4-person fatal injury Airbus AS 350 B2accident near Chickaloon, Alaska, that identified the interference susceptibility of the atorFile.ashx?EventID 20080421X00524&AKey 1&RType Final&IType FA3. Unknown case number (F-GKDP, 1998, aerial photography flight) – An Airbus AS 350 B2 accidentin France, where the passenger’s unintentional movement of the FFCL resulted in an enginefailure and subsequent hard landing.https://www.bea.aero/en4. HCL 62/96 (OY-HEC, 1996, aerial photography flight) – A 1-person fatal injury Airbus AS 350 B1accident in Greenland, where the passenger’s unintentional movement of the FFCL resulted inan engine failure over water and subsequent p?lang en5. A94W0037 (C-FHBG, 1994, helicopter air ambulance flight) – An Airbus AS 350 B accident inCanada, where the FFCL was inadvertently moved by either a patient or a backpack, whichresulted in an engine failure and subsequent hard rts/aviation/1994/a94w0037/a94w0037.pdfPage 4 of 5
Additional References:1. National Transportation Safety Board Safety Recommendations A-10-129 (to the FAA), A-10-130(to the FAA), and A-10-131 (to the European Aviation Safety Agency), referencing ANC08FA053,involving the design and interference susceptibility of the FFCL in the Airbus AS 350 safety-recs/recletters/A-10-131.pdf2. Transport Canada Service Difficulty Advisory AV-97-07, referencing A94W0037, recommendingthe installation of a control quadrant safety guard for the Airbus AS 350 tification/1997-01.pdf3. Accident Investigation Board Denmark Recommendation REC-11-96, referencing HCL 62/96,recommending the installation of a system to protect the FFCL from interference for the AirbusAS 350 lang en4. FAA AC 91-32B “Safety In and Around Helicopters” provides guidance on safe operations forpassengers during helicopter ground and flight a/Advisory Circular/AC%2091-32B.pdf5. FAA Helicopter Flying Handbook (FAA-H-8083-21A) discusses safety in and around helicoptersfor passengers.https://www.faa.gov/regulations policies/handbooks manuals/aviation/helicopter flying handbook/6. FAA AC 20-109A “Service Difficulty Program” describes the Service Difficulty dvisory Circular/ac20-109a.pdf7. Additional AASF aviation safety educational resources.https://www.aasfonline.orgPage 5 of 5
The floor mounted control quadrant is a design found only on the Airbus AS 350 series (AS350 B, AS 350 BA, AS 350 B1, and AS 350 B2). Some AS 350 B3 models have the main rotor brake lever and the emergency fuel shutoff lever mounted on the fl
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Airbus AS 350 IBF Common cockpit switch with the Donaldson IBFs for the Bell 205A, 206L-1/3/4, 407, 430, AgustaWestland AW119, AW139, Airbus AS350, EC130. Easily viewed and
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