Ground crew (flight or service interphone) are calling the flight deck. Single-tone chime sounds when either the cabin crew (service interphone) or The blue CALL light on the overhead panel illuminates and a Note: Mode S transponders will be mandatory in When selected, modes A and C will only transmit when the aircraft is not on the ground, but mode S will operate regardless of air/ground status. Note that with the mode switch in the STBY position, no transmissions will occur. Normal internal service interphone operation The switch on the aft overhead panel activates the external jacks There is also a pilot call button and a nose-wheelwell light switch toĪssist the groundcrew to insert the steering bypass pin. Interphone switch on the aft overhead panel must be switched ON for this Service interphone stations inside the aircraft. The service interphone is used by engineers to communicate with the It is used by groundcrew toĬonnect the Ground Power Unit and headset for pushback communications It also discusses the use of ACMS data within an airline and how hard landings are measured. This video covers the CVR, FDR, ELT, LF-ULB, DFDAU and QAR on the 737. It is illegal to stop the CVR in flight.įDRs and CVRs have an underwater location device that, when activated by water, emit an ultrasonic pulse at 37.5 kHz every second for a duration of at least 30 days.įor information on the Flight Data Recorder (FDR) click here In the event of an incidentĬrews are advised to pull the CVR c/b after final stop to avoid automaticĮrasure. Loop tape until 5mins after last engine shutdown. Start with the first rise in engine oil pressure and go onto a 120 or 30min (as The CVR records the headset and microphone of all 3 ASP's Sounds if the aircraft is being selcal’d on either HF or VHF. The SELCAL light will illuminate and a two-tone chime The marker tone can also be heard if selected on the ACP. The markers are pre-tuned to their 75MHz frequency and illuminate when overflown. There are very many different Nav radio boxes in the worlds 737's the second shown here is the new Multi-mode nav panel which is used to tune VORs, ILS, & GLS. Hear faint stations without having to hold down the test button - very If you switch the panel OFF at the same timeĪs TEST is applied this holds the test condition thereby allowing you to The TEST button isĪ squelch and is used to hear faint stations that do not have the This unitĪllows for selection of any of those at this station. Most 737's have three VHF radios and at least one HF radio. The F/O's ACP in degraded mode is the same but uses VHF2. NoteĪural warnings will still be heard over the speaker. Through mask or boom and can only receive VHF1 at a preset level. If the Capts ACP is in degraded mode, he can only transmit on VHF1 Check this if nobodyĬan hear you transmit - especially after your oxy mask mic check!Īlt/Norm in the ALT position puts the ACP into degraded mode. Mask/Boom simply selects either mask or boom mic. Has not been left in the V position if you can't get an ident. Voice or morse identifiers on NAV & ADF radios. The filter switch, Voice-Both-Range, allows better reception of either ie in the INT position bypasses the mic selector to transmit on Radio/Int works in the same way as the rocker switch on the controlĬolumn. This type of ACP has cylindrical button volume controls, others have
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