FAA SAFO Focuses On King Air Boost Pump Failures | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

Airborne Unlimited -- Recent Daily Episodes

Episode Date

Airborne Unlimited-
Monday

Airborne-Unmanned w/AUVSI-
Tuesday

Airborne Unlimited-
Wednesday

AMA Drone Report-
Thursday

Airborne Unlimited-
Friday

Airborne On ANN

Airborne Unlimited-03.18.19

Airborne Unmanned-03.19.19

Airborne Unlimited-03.20.19

AMA Drone Report-03.14.19

Airborne Unlimited-03.15.19

Airborne-YouTube

Airborne Unlimited-03.18.19

Airborne Unmanned-03.19.19

Airborne Unlimited-03.20.19

AMA Drone Report-03.14.19

Airborne Unlimited-03.15.19

ANN's AEA 2019 LIVE Coverage Starts Monday, March 25th at 1115ET, 0815PT. Continues Tuesday/Wednesday. www.airborne-live.net -- Don't Miss It!

Mon, Feb 12, 2018

FAA SAFO Focuses On King Air Boost Pump Failures

Possible Engine Failure Can Result From Improper Fuel Management

The FAA has issued a Safety Alert For Operators (SAFO) following a boost pump failure aboard a Beechcraft King Air 90- series airplane.

The FAA noted in Safety Recommendation (SR) 16.127 that a boost pump failure in King Air 90-series airplanes leading to automatic crossfeed operation could result in dual engine failure if not managed properly by the pilot.

With a boost pump failure and the crossfeed switch closed, the High Pressure (HP) Fuel Pump on the side with the failed boost pump is able to suction-feed fuel from its Nacelle Fuel Tank and both engines continue to operate. During normal operation, the crossfeed switch is in the auto position and will automatically open in the event of boost pump failure.

If the boost pump fails, the emergency procedure in Section 3 of the Aircraft Flight Manual directs the pilot to momentarily close the crossfeed valve to determine which pump failed and then open it again, turning off the failed boost pump. The Emergency Checklist further states “If continued flight with the crossfeed closed is required”, CLOSE the crossfeed and monitor for power fluctuations. With a boost pump failure and crossfeed OPEN, fuel consumption is double the normal amount from the side with the operating boost pump. If improper fuel planning allows fuel to be depleted on that side, both engines will most likely flameout while usable fuel remains in the tanks on the side of the inoperative boost pump.

If that happens, options become limited. If the crossfeed valve is subsequently closed manually, the HP Fuel Pump on the side of the inoperative boost pump may still suction-feed, but if crossfeed remains OPEN, the HP fuel pump may instead only suction air through the empty crossfeed line. There is no engineering data to determine either way. As such, there is clear risk that a simple boost pump failure, if not managed properly, could result in dual engine failure.

Recommended Action
During training and operation, King Air 90-series owners, operators, and training departments/centers should emphasize the following:

  • In the event of boost pump failure, if the pilot chooses to continue flight with the crossfeed valve OPEN, adequate fuel quantity should be verified on the side with the operating boost pump considering fuel burn on that side will be double with the crossfeed OPEN.
  • In the event of boost pump failure, if crossfeed remains OPEN and fuel is depleted on the side with the operating boost pump, a DUAL engine Flameout will most likely occur.
  • In the event of boost pump failure, the crossfeed valve must be CLOSED for the HP Fuel Pump to scavenge-feed fuel from the side of the inoperative boost pump.
  • In the event of boost pump failure, proper fuel monitoring and management is crucial to avoid fuel starvation leading to engine failure and/or fuel imbalance beyond limitations.

(Image from file)

FMI: SAFO

Advertisement

More News

Airborne 03.18.19: Chipper SS Unveiled, 777X Reveal, EAA Spirit Of Aviation

Also: USCG Awards Air Medal, Liberty University Aviation Program, Sen. Moran, UAL HQ No one has to tell you that the cost of ‘just plane flying’ keeps getting greater..>[...]

AMA Drone Report 03.14.19: DRL Update, External Markings, DJI Canada

Also: Lego Disses Drones?, Drone Defibrillator Delivery, UK Airfield Restrictions, Airborne Programming The Drone Racing League (DRL) has announced a new streaming partnership with>[...]

Airborne-Unmanned 03.12.19: eHang IPO, UAVs v Tornadoes, Northwest UAVs

Also: SpaceX Crew Dragon, AUVSI USDPS Event, XQ-58A Valkyrie, Global Hawk At Avalon 2019 A Chinese drone company has plans to undertake an initial public offering in the US, in ord>[...]

Counting Down! ANN's Infamous April 1st Edition Is Back--With A Vengeance!

Send Us Your Wacky Ideas NOW! ANN E-I-C Note: Folks... we gotta warn you... our Annual April 1st Editions are LEGENDARY -- and after a break last year (due to a death in the family>[...]

Aero-Help Wanted: ANN REALLY Needs A Sales Pro

ANN/Airborne/Aero-TV Marketing Department Needs Part or Full Time Personnel E-I-C Note: For some reason, finding really motivated/honest/professional sales help has been a tough gi>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2019 Web Development & Design by Pauli Systems, LC